Chris brings up an extremely interesting point here. You're seeming to miss the difference between an artificially influenced metagame and a naturally influenced metagame. The tiering of Pokemon has always been based on the idea that the best battlers will use the best Pokemon to make the best teams, and this works because the sole motivation of the majority of battlers is to win. Problems arise when you create a second objective irrelevant to actual competitive battling. This has been the issue since the beginning of the Suspect Test, where one of the major complaints has been how the Suspect Test has influenced the metagame to add a second objective: the use of the suspect. Now here's where it gets interesting.
http://www.smogon.com/forums/showthread.php?p=1677628#post1677628
http://www.smogon.com/forums/showpost.php?p=1679526&postcount=90
In these two posts, you make the case that the metagame will "stabilize", and that usage of the suspect will wane as people realize that it has issues and the metagame is flooded with counters. However, the existence of SEXP actually completely neutralizes this possibility, as people realize that if the suspect's use goes down, they won't get required SEXP, and so they use it themselves in order to ensure they get necessary SEXP. In fact, I'm guessing there's a spike in end of testing usage, as people want to cram in as much SEXP in as possible. Combine this with the fact that the Suspect Ladder doesn't see nearly enough usage, and it actually completely overrides the natural progression of the metagame that you outline here. So do you think that this is still true, and that metagame procession continues to naturally occur, or do you think that metagame procession is not necessary to the testing period, and that you're willing to sacrifice the natural balancing of a metagame for whatever it is that your Suspect EXP gives you?
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Now onto another matter entirely- the way that Suspect EXP can affect UU. First, let it be said that it WILL affect UU. There was a little bandying about that the use of SEXP could be secret, and that would be the only way that SEXP would fail to have an impact on the metagame, but considering that this discussion is now in PR, the cat's kinda out of the bag on that one. As far as I'm concerned here, Chris is right for the wrong reasons. (By the way, while we're on that subject, I'd like it if you didn't use me as some kind of proof that Chris is wrong. Sure, he was guilty of trying to "have it both ways" there, but I never said that he's wrong, just that he needs to watch out for contradicting himself.) He's concerned about the impact on the stats (which I believe will be minimal), whereas I am concerned about the impact on the voting pool. There have been some rather borderline suspects in UU, notably Crobat, and considering the original overwhelming 0-20 vote to keep it UU, I'm willing to say that I'm not the only one that thought Crobat to be rather mediocre. The only reason I used it at all was for my Stall team, and it was the least useful member of my team. I ran LonelyBalance on an alt for a while, and once again, Crobat was the least valuable member of my team. On teams other than my Stall team, I simply didn't use it. Now, I'm willing to bet that I'm not the only person that thought this, and at that point, it becomes luck of the draw as to whether or not I end up with enough SEXP to vote, since if I don't use it on my team, I have to encounter it on the opposing team.
This is my issue. Suspect EXP requires the person to use it in order to guarantee decent EXP amounts. The people that are more likely to use the Suspect are people that think it is broken and want to get it banned, and thus will use it on 100% of their teams and rack up huge amounts of SEXP. Meanwhile, people like me that honestly don't think that the suspect is actually that good, and thus don't want to shoehorn a "mediocre" Pokemon into their team, have to roll the dice and hope they end up with enough SEXP to vote. The end result is that the voting pool is skewed towards BL voters, since they are guaranteed to have the necessary SEXP to vote. Meanwhile, people that don't think a Pokemon is all that great, or simply don't run teams that are conducive to using the Pokemon, have to gamble and hope that they meet the suspect enough to vote. I believe this was an issue in the Latios vote with FiveKRunner, where his SEXP was extremely low, and his record with Latios was heavily oriented towards the losing side.
I honestly don't think that this is at all fair to the people voting. If a person builds teams with the suspect, loses a whole bunch, takes it out, and then proceeds to start winning a huge amount of his matches (thus meeting the rating requirements), I would assume that person is capable of saying that the Suspect is not all that good, since in his experience, the Suspect was simply not good enough to earn a spot on his team, and teams without the suspect were more efficient. Sure he may not have much SEXP, but that doesn't change the fact that he has very real experience with the suspect that has told him that the suspect is simply "not good", and therefore not broken.
To summarize, SEXP use in UU with non-predetermined suspects slants the voter pool by allowing 100% of rating-qualified BL voters through with the very real possibility of excluding otherwise qualified UU voters because of an intangible system based on the luck of "encountering a Pokemon enough."
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Finally, I want to bring up one last point about SEXP that I have never been fully certain about. The reason that the SEXP formula is not publically available is because there are apparently some "breaking flaws" in it that allow people to disproportionately gain Suspect EXP through specific flaws in the system. However, with the amount of time that it has been around, and the amount of time spent defending this secrecy to anyone who pokes, wouldn't that time have been better spent either trying to fix whatever exploitable flaw there is, or at the very least, implementing a way to make it blindingly obvious who's intentionally gaming the system? I generally have doubts about any system that is so flawed that the only way to keep it secure is to keep it hidden, because that doesn't exactly assure me that the system is even working as intended, since obviously there are variables inside it that can skew the output data in unintended or unknown ways. Also, considering how Doug has made the point on IRC that even if the source code was available and the formula made known, it would still be extremely difficult to decipher it at all, do you really think that someone is going to go to all the trouble to decipher the system and cheat when it's likely easier to just make the damn qualifications naturally? If it's that hard to just get a basic and cursory understanding of the system, are you really scared of someone breaking it? If anything, people breaking it would give you a chance to "unbreak" it, thus resulting in a stronger formula in general. As far as I'm concerned, it's a win-win situation. On top of that, the actual current Suspect Test in OU is pretty much done so far, and since as far as it seems, use of SEXP in UU would be extremely limited, the effects of releasing the formula would simply be a better understanding of the formula in general.