What's the biggest Kickstarter on record so far? Keep in mind that, while tiny compared to the total US budget, NASA's budget is still $18 billion/year.

Edit: While not a Kickstarter, I think Star Citizen might be the crowd-funding winner. Even they have "only" raised $150 million so far. That's a lot of money for a space video game. It's not a lot of money for actually going to space.

Goal: Land humans on Mars.

Stretch Goal: Bring them back!

You jest, but if I ever get the opportunity I will take a one-way trip to Mars without hesitation.

I don't doubt your dedication.. I just try to imagine a week later after the initial "I'm standing on MARS!!!" wears off... ok... so... there's nothing here...

Ok, fair point. There would obviously need to be a mission plan that involved a bit more than "go to Mars", but I think even thoroughly monitoring my slow death by radiation over the course of a few months would be sufficiently scientifically worthwhile that, along with the sheer fact of going to another planet, for me to volunteer.

It's not worth it to science to justify the cost of sending you.

A better stretch goal would be to build a permanent presence there.