Thank you for your interest, you pose a good question.
members who try to create multiple accounts or use proxies or use tor or "game the system" in any way are automatically banned.
easybitcoin runs a check on each member every time they log in to check for multiple accounts etc.
easybitcoin uses multiple factors to determine if a member is trying to cheat the system.
we don't rely on just IP addresses as some other sites do. our efforts are much more extensive than that.
We use solve media for our captchas and they are very effective against bots
also if captchas are entered too many times incorrectly the member is suspected of using a bot and is banned.
any clicks by non members are free.
I have spent considerable time building up the member base to provide people with traffic,
I would be cutting my nose of to spite my face if I were to "click bomb" my customers....
if you have any other questions please feel free to ask.

regards

teamfresh