It's remarkable what a difference a measly dollar makes when you are trying to dare someone to do something. First of all, offering a buck in exchange for a potentially embarrassing stunt somewhat balances the dynamic between the darer and the daree; the daree is now getting token compensation for participating, and is no longer considered to be an unpaid submissive. Likewise, the darer ceases to be a demanding bully, and is considered a party to a bet instead. Try it sometime, and you may be surprised on how the situation differs from a garden variety unpaid dare.