The list is based on popular vote yes, for the last couple of months I've received a 1000 promotional - read as 'lobby" - emails and flyers from everywhere (agencies, promoters, etc.) asking to vote on this, and that, etc. So have perhaps a million others involved in dance music... parties are organized to cast votes for the in-house DJs and all, it's pretty competitive!
Again I'll say what I said last year, and every yr since the poll was estabilished: we may disagree with the results but they are based on popularity, and trance/house/prog are in high demand these days, whether we like it or not!

And the DJ Mag poll is the official DJs poll, whether we accept or not.

Now, if the house/prog/trance fraternity is the most active and voting one... the voted jocks are not the ones to blame heh?
Besides, the "top DJ" crown is not necessarily the "Best DJ" title, as the "best" is a very controversial, ample and subjective concept. The "top DJ" is, IMHO, the guy who, for the past yr or so, showed some consistence and reach with his/her work as producer and DJ, just that.