Idea for a "bounty hunter" tournament / reward system

I had an idea for a fun (or so I hope) kind of tournament / reward system: Each player has a bounty on his head, depending on his recent success, voted for by players or something similar. When you win, you add half the bounty of your opponent to your own. When you lose, duh, you lose half your bounty to your opponent. At the end, you get your bounty paid out. There have to be some rules, e.g. you can only initiate a game against someone with a higher bounty than you have, or at least so-and-so-many % of it. There is a LOT of finetuning possible and perhaps necessary, but what do you think of the basic idea?