Actually started working last night on a similar idea las Ryan posted and wondered if I should integrate into BetKing.

Was excited about the fact that:
1) Provably fair for investrs, but also
2) Your site could be legal in every country as you can have the investors be the ones who process the bets. You are just match making. Like BitTtorrent.
3) Possible to have reduced server costs but this isn't much anyway.
4) Investors can't cheat players as BetKing still acts as escrow of funds.

However after some thought I don't think it's really worth doing.
I personally don't need any extra trust from investors.
Poker would need to be processed on my own server so that can still be a legal issue in some places.
Poker needs no investors and isn't provably fair anyway.

Also in long run if you wanted big FIAT site to buy me out then I doubt they would buy a platform that relies on investors being distributed like that.
I wonder though if it means you could allow FIAT deposits legally if you're only acting as escrow?