whilst I don't agree with what you're saying, I think a lot of people are simply put off by the prospect of pvp rather than disliking it. thus my suggestion to add further encouragement to entice a person on the fence to participate.
I think it may be the 10th day or more now since a tournament has started.
I think incentivising people to just enter would really be beneficial. Allow money just for participating like 1m so people get something for coming.
OR/and
Lowering amount of players required to start