Wait wait wait, Kungen is a goblin now? BLASPHEMY!
Oh, and for those thinking 10 mans are easier...
A) by losing a single player, the raid group loses 10% of it's performance, in a 25 man it's mere 4% performance loss
B) you get less loot in 10 mans, which means that 25 man raiding guilds on a single person mathematically get more drops than a 10 man raiding guild
This is before considering the mechanics of each encounter. Two advantages for 25 man guilds already, right off the bat.
Herp derp 10 mans r ezmoad rite guis