I'm pretty sure they lose the same amount whether they d/c or play the whole battle. They're probably just doing it to save time.
How do people get all these 5IV Shinies that they're trading on their threads in the wifi forum? It can't all be gen 5 RNGing can it? By my calcs even breeding two 6IV pokemon from different regions gives you 1/6 * 1/1365 = 0.01% of getting the proper 5 IVs in a shiny, worse if you need a particular ability. Is it just a LOT of time on their hands or is there something I'm missing?
They could just be generating them with an external program also. (With the Masuda method and Shiny Charm, gen6 breeding gives a 1/1024 chance of getting a shiny, not 1/1365. But you still multiply that by 1/6 to get the right imperfect IV, assuming you use a Destiny Knot.)
I wonder this myself too sometimes, but if it's not a gen6-exclusive pokemon (e.g., Aegislash, Greninja, etc.) then I just choose to believe they use an external generating program.
I'm new to the competitive scene this generation and doing my best to understand everything. So I get that items/abilities/moves that affect evasion are banned and looked down upon because it relies on the probability aspect of the game but does the same go for crits? For example, my Sniper Kingdra holding Scope Lens and using Focus Energy to get crits 100% of the time. It seems unfair to me but I can't find anyone saying it isn't.
All of the crit-related stuff is allowed. I think the reasoning for allowing it is a combination of several things:
(1) Despite the changes to crit in gen6 (i.e., there are only 3 crit stages, and the highest is 100% crit), there are still very few pokemon that can pull it off. (Kingdra, Absol, and maybe something else, I can't remember.)
(2) Those particular pokemon may not be viable or may have other glaring weaknesses that are easily exploited.
(3) Evasion is different from crit because crit makes damage go from 100% to 150%, but Evasion makes it go from 100% to 0%. It's a much more exaggerated change to game play. (Evasion also affects status moves, whereas crit just affects damage.)
(4) Similar to (1) and (2), every pokemon can make use of items like BrightPowder and every single pokemon can learn Double Team via TM. (Actually there are some exceptions: Wobbuffet, Wynaut, Kricketot, Burmy, Tynamo, and Spewpa are the only pokemon that cannot learn Double Team, in addition to any pokemon that cannot learn TMs at all, like Combee.)
(5) Crit builds do have counters, the most obvious of which is a bulkier pokemon (crit ignores temporary defensive buffs, but obviously does not ignore typing and Def/SDef before buffs). Evasion builds have literally one counter: moves that bypass the accuracy check. The only viable accuracy-bypassing damage moves that I know of are Aerial Ace and Aura Sphere. (Roar/Whirlwind also bypass accuracy, so that is an alternative.)
So since Evasion is readily available to every pokemon, has few counters, and turns the battle into coin flips, it is deemed uncompetitive. Crit does not actually have the same properties, and so it is accepted.