First, re read the post. If UO approved the deal, then they would by nature have some control over it.
One thing that could be required, is that everyne who has a vendor would be covered, by taking a representative a rune to said vendor. Or a designated drop point. This would be part of the deal. And tbh, I think the only place nowdays that this could be a problem would be on Atlantic just becuase of its size.
Second thing- I set the price for the item on my vendor. If it sells, I really dont care to whom, I got what I wanted for it, whether you bought it or the search site bought it.
And for the record, the site Im thinking of has given me years of great service, fast, courtious, and without the hassles and constant frustration of dealing with UO's own website store.