Just an idea, but don't we as an active player base have the ability to capture the names of these players & guilds of these 30,000+ 500 match players?
I'm thinking that towards the end of the week, we could scroll through our own battlelogs and start listing this info for all these high volume players.
I can only assume they are in guilds because it is very very rare to find someone in your battle log who has 'none' as their guild. Usually, these are just people in between guilds who are known to the forum users.
It's early morning, so perhaps I am not thinking right. But could this work?