I've sold a l-ll.com domain just for 5$ some five months ago. Isnt that really cheap. I actually want to know what a L-LL.com really worth? A domain like "v-in.com" .
With current rate there are still 4 LLLL available but will be over soon Before 5 months there was a bigger availability I don't think is cheap but you could sell it at least reg.fee ($7-8) Try the appraisal section. It's more appropriate for this questions
A hyphen is sometime good for joining two words but not good for 3 or 4 letters, however you could have sold it below $$ value, I guess.
Probably you were lucky, most available short domain names don't really worth, that is why they are available.
Were you the buyer? I don't think that they would have a lot of value as there are still many LLLL.com available
It was worth just about what I paid, $5. It has no purpose or value other than I wanted a couple short domains to play with.