It's been quite a ride, reading all these posts. Admin, good to hear you are deciding against this.
IMHO, swaps and sales are two different things. When participating in a swap, we are clearly advised to be gracious. The need to be told that is somewhat appalling, but nevertheless, it's an important trait. If you can't live with what you might get, either don't participate, or create your own with carefully vetted participants.
Sales are something else. Don't ebay and etsy provide some kind of buyer protection? Maybe people should be selling through them, and simply posting a link at this site.
This is a quilting site, pure and simple. In fact, isn't it "The Quilter's Message Board"?