Online Poker for Macs - Free Mac Poker

Getting staked to play online poker has gotten popular. I first thought poker staking was a dumb concept online but it sounds like it works. There are a few forums that have this staking stuff. I've personally never staked anyone. The only thing I don't really understand is why anyone would want to get staked if they are a winning player? To me that just doesnt make sense. But, these forums only take winning players and they have thousands of members.