One thing I'm experimenting now with is a special PvP variant of bustabit with high bonuses, starting from 0.9x and being 0% house edge. And to limit the unbounded risk of offering a 0% house edge game, if the net profit is < 0, there will be a small rake. (e.g. if the game loses 20 BTC, there will be a 0.1% rake, or 100 BTC and a 1% rake etc. )
Oh, I'd play this. Taking away the house edge makes it a completely different game, one where skilled players can still gain an edge since it's purely p2p.
It all depends on the rake structure, though. It's a little confusing when/how you are planning on implementing the rake. I feel like there's probably a way to run the game where everyone "buys in" and you take a small rake off the top, but I'm unsure if many people would be interested in playing that sort of variant.