How much would it take for you to sell a once-in-a-lifetime opportunity? If you won your choice between a pile of cash and a non-transferable chance to fly to and land on the moon, how much money would it have to be before you'd strongly consider taking the cash? A million dollars?
I think I'd sell out for less... one or two hundred thousand, maybe. (Of course, the trip would sell for far more than that, but the conditions said that wasn't an option.)