I'm taking teh 'low' road on this one. I see your predicament needing money and needing the work.
On the other hand, I doubt he has any idea how much time, work, and money went into the quilt you made.
I agree, "If it sounds too good to be true, it probably is".
Also, I like the numbers crunch someone did.
Highly unlikely anyone will pay those prices unless they have money to burn.
And once the quilt is made, he has the finished product, and if it does not sell, where and how will it be stored until sold?
Too open-ended a deal.
I would run the opposite direction. You don't loose your shirt (so to speak) and you can still enjoy your hobby and make the quilts you want.