would anyone be interested in a 1v1 tourney?

I want to host a tourney with 15k RP as a prize, but i dont know if people would rather play a 5v5, 3v3 or a 1v1. Also if its a 1v1 i dont want to have a second place or a third place prize unless i make it 9k first, 5k second and 1k third or something like that.