have you seen people using fake banners to advertise their site? payment proof

This is the problem with payment proofs, how do we know they are real? We don't. So at the end of the day we still don't realise which site is a scam until we are actually payed into our own pocket. Nowadays it is just so easy to photoshop and change things and making payment proofs is probably not even hard, even I could do one in photoshop. Who would make those fake payproofs though? The owners of the scam site? Or the people getting payed to do it. We just have to be so smart and careful to not be fooled, we can only rely on what the majority say and if a site is known to be paying only some of it's members well that says something doesn't it? That says we must now say bye-bye to that site.

for which site r u talking abt,i have not seen any fake proof,if it is happen it can be?

Yeah there's a lot sometimes other use others banner or payment proof. shame on them.