Hmmm. I agree about getting it appraised by a third party, get that in writing, and don't start the bid at 500.
I used to sell on Ebay a lot, often figurines and other items of value to certain animation collectors. You never know what a piece will sell for. I had what I thought was a really valuable Disney snow globe sell for $15 once, and also, what I thought was a relatively worthless porcelin Disney figurine of a raccoon sell for over $100 to someone in Japan (who paid me in US cash, and sent me a box full of Tokyo Disney goodies to show their appreciation).
So it all depends on the person whose eye it catches.
Another thing I have to mention is that art, framed, esp. is a BIGHUGEROYALPAININTHEBUTT to ship. Art, of any kind is very fragile, sensitive to the elements and boxing it up is going to cost you depending on the size of the piece.
I tried to ship a framed poster once. It was a nightmare. The materials required to pack and ship something that akward in size are costly and the person buying the poster didn't belive me that it cost as much as it did to ship and was really nasty to me. The frame cracked in shipping, even after I had it professionally packed, ripped the poster and I had to reimburse the person.
Your friend might be better off trying to sell the paintings at a local flea market, art show, or even by taking a for sale ad out in your local paper. For his own sanity.
Or if he's feeling generous, and the paintings are appropriate, maybe donating them to a school or library, who I'm sure would be very happy to have them.
Hope this advice helps.
Sheri