It doesn't matter. All are irrelevant in the big picture. If you are claiming that they are the "top", then why are you comparing them to the "average" of retail? Unless you're saying the "top" here is equivalent to "average" on retail? Unfortunately, I have found that to be rather accurate, because people seldomly seek methods to increase their dps, and they don't seem to invest their gold into such; like providing their own flasks, getting food for themselves (which is better for them than the fish feast provided for them by the guild vault), or carrying around enough potions to pre-pot on every boss, and every pull after every wipe, to min/max dps. But then those people who would do that probably don't even bother to track their threat and use the tricks available to them to keep themselves from over-aggroing.
Conclusion: The "top guilds" on Warmane usually are just gatherings of over-geared average players. There are some individual exceptions to this, of course, but that is fairly rare. Maybe 3 or 4 out of 25 people.