So what guarantees that they'll see the advertisement? If I was the me five years ago that didn't do anything but play, I'd probably overlook anything that isn't impeding my play time. That's how a lot of people are, and by that logic things won't change.

The idea is in theory pretty good, but I'm skeptical on an actual performance.

clans earn reputation themselves by having good, active members ingame or on forum. That's why we have tags and info on usercard. When someone find clan with interesting members, he can easily check everything out and apply. I wont be fan of new clans made by random users who buy tc and spend it on shitload of ads.