There really is no other way than to come to an agreement between the both of you
It's your money, you should have the 1 and only say on it

1) If you're not willing to take the risk, dont deal
2) If you're willing to, then go ahead with the deal
3) Try coming up with something in between, ask for half the amount or something first

Btw, this is not the right place for asking oppinions
Closed