You are legally responsible for paying for the promotion upfront and fulfilling the prize you advertise in your CliquePrize promotion – exactly as is. You are not obligated to buy Contestant data. That is optional. However, you cannot legally bait and switch the Contestant. In other words, you cannot for example offer 2 tickets to a show but give them a pack of gum instead. The only time you can switch the prize advertised is if you are giving away a prize of equal value to the original prize and the Contestant agrees it is a fair swap of prizes. The Contestant can hold you (not CliquePrize) legally liable for not fulfilling the original prize advertised.