Could also encourage 13 others to do the same, reducing the user activity in the game because they don't need to watch games,ads,etc. Could also encourage 13 others to quit because the game is rewarding teams that just sit around for months doing nothing, making the game boring and easy to win with >130% teams.

As it is at the moment, I believe that is hurts more the game than is helps active players and devs. Why would you waste money if you could get the same result for free? You'll probably see 13 teams tanking because of 1 top team that reached that level because of tokens that the other way around.