I hate to disagree with you, Queg, but I think I have to in this case. As far as I can see, there are only three servers. While that's probably an increase from the 2.0 days, saying that the costs are to cover the server charges is a little skeptical. Even so, from what I've seen, Nabi Studios only uses money to improve. I'd pay another $20 to see a new game come out.
Oh, and in reference to the three servers, see below.
guyz
we hate ads too, but we needs the extra money to build moar games.
now, I've decided, that we will only put an ad up the top there, unless someone offers me a rediculous price otherwise
and, if we ever do it in the game, it'll be on the floor only... trust me, it's awesome when you see REDBULL on the floor.