I don't think that a prize that can be won will be sufficient motivation. The way you are suggesting the set-up is merely shifting the risk from one entity to another, but the real overall prize, some decent economic benefit, remains highly uncertain. Even if we do find, on the Moon or on Mars, something that is extremely valuable here on Earth, the cost of getting it will still be prohibitive. Even if we find some primitive life on Mars, that would then be interesting for journalists and scientists, but it would not materially change our lives. There is simply not enough to look forward to in our solar system by the looks of it. Space travel could of course deliver us inventions and beneficial discoveries, but buying a lottery ticket offers about the same chance of juicy gain, and is millions of times safer, easier and cheaper to do. I am not suggesting that the aforegoing is my own view, but it seems to be the view of the majority of Earthlings. <br /><br />That is nothing new of course, for Henry the Navigator had to motivate his captains and sailors to dare go past the horn of Africa, Columbus had to motivate Isabella and Ferdinand to make available the necessary funds, etc. And in all of these cases it boiled down to the same thing it boils down to today, namely, it is highly chancy and dangerous and 'is there a cauldron, well filled with riches, at the end of the rainbow?'