I saw on a certain site with the following text (it is an image), I didnt copy it word for word but the idea is: Isnt this "providing incentive" to click?
You are basically paying people to click which is a big violation of the TOS. Its worded to sound like revenue sharing but it isn't. Accepted revenue sharing is when people use their own AdSense ID. I would stay away from a contest like that.
It is a UK site. Something like SU*K.co.uk or something. (Play around with the letters just like the brand FCUK)...