Personally, I collect LLLL.com domains but this isn't one I could see going for any more than reg fee I'm afraid.
However, with the availability of LLLL.com domains dwindling I expect that this value will increase somewhat when they run out.
So, I would say $8-10 at the moment, unless you find an end user who is desperate for that particular letter combination. Leave it a few months and then come back and we will see if it has changed any
i got yvir.com 2 yrs back and put up a directory on it, from adsense and links i get about 50$ a month. more than covered up for its cost...do somethign like that ..or if u have other plans..well