I respectfully disagree, the reason it seems that the player-base on Beta has overall lower abilities is because our player base is much smaller. A smaller player base inevitably leads to a smaller amount of good players, creating that illusion. I'm fairy certain if there was a way to quantify the "average" abilities of Smogon's player base and Beta's player base they would be about the same.
Also, although I do agree that ranking is largely irrelevant for players who don't frequent Beta, the fact is that if you have been on Beta long enough to "be tired of playing bad players," then you go there enough to have a high ranking.
I'd like to point out that I'm not referring to the entire Smogon Community when I say this, only those who are too idiotic to realize that Smogon is just bigger, not better than PO. Get off your high horses, bashing the PO community is pretty stupid, considering everything that's going on in Smogon right now.