Possibly, but they can't get the book from the seller if he doesn't send it.
Comiclink has the same problem... if the seller doesn't agree to the price (even if it's a "buy-it-now" price) within a day or so, then the sale doesn't go through.
So they don't have to send it in to consign it?
Apparently not. Once I "purchased" the book, I received an e-mail from ComicConnect stating they had contacted the seller to have the book shipped to them . So the book(s) apparently stay in the seller's hands until they actually sell.