I dont know if this has been done before,But i was thinking maybe like not the person with the most will win but it will increase his chances
So even a nvidia miner may win but it will be highly unlikely.So this is my idea People pm me for worker login details (it will all be pay per share),so when my account balance hits 5btc i will draw the prizes (don't worry i wont enter) and the prize will be as follow 1st 0.5 btc ,2nd 0.25btc 3rd 0.25btc so total prizes = 1 btc and if my acount hits 5 bitcoins fast i will double the prizes and the account (can't think of a word uhmm..) threshold to 10btc .oh and i forgot to say i will use a randon number generator for the winners and if my acc isnt even close to 5btc within 2 weeks i wont draw the prizes but lets say in 2 weeks my acc balance is only3 btc i will still draw