User blog comment:Freedfg/What happened to variety./@comment-4022742-20140430175736

It's also due to the "Pro" scene tournament mechanics. In tournaments you can play a fixed set of champions, the base that has been here since beta. And then the seasonal additions that consists of new champions, limiting the champion pool that is used in tournaments.

This is a big factor in what's "Populair" since some champions don't get played by pro's cus they are unavailable in tourneys. So people that watch tournaments will think the champions not picked up are less viable due to that. Which is hardly the case.