ok, i talked to doug nelson about the links, who in turn asked the author about it. the answer is, the library is based on domains. so, we can only have one worth1000 or one ebay or one amazon.com type link. one of each of those domains. he can turn that off, but then i'd be doing nothing but looking for duplicate links when someone submits something and that's just not very workable. he did make a request to the author to amend this, but we'll just have wait and see.
so, thanks, albatross, but for now i guess we just live with what we've got.