You mean: some-web-site.net ?? Not really. one hyphen itself is difficult for people to remember + G these days does not give positive points to such domains.
I don't think they would be worth much, people generally tend to forget a single hyphen in a domain, let alone two.
Ok, I think we have established that they are not worth much but does anyone want to buy 50 of them for $4 each?
I have a hyphened domain name (two hyphens) and have not been able to sell it. Abandoned it a long time ago.
These aren't good for resell purposes or to market to end users, semi-ok for development but suck if you want to make a professional/huge website.
I'm fairly sure they wont be worth much, since furthermore they are .net At least with a .com, it gets a little better...(a little)
I would say that all N--N would be gone and most probably all L--L too, these would be worth something although I'm not sure what