I guess I'll lose out users to these sites then unfortunately. I've contacted virool with some questions regarding security, and based on what they say there's a chance I will raise the payout more. I can't say how these other sites deal with this issue, but I suppose I could contact them to clarify some things if needed.
have a look at the open source of
http://coinvideo.appspot.com see how security is over there, maybe?