There is no question the LLLL.com market is just beginning to simmer. There are reported sales, and many wholesale reseller sales that can be found both on the boards and on ebay.
It seems to me that with a pronounceable LLLL.com you can do no wrong, however in this case you have quite a few questions. The first issue is that this names value derives only from its rarity, unless you can find some obscure acronym for it.
You could part with it on ebay my guess at approximately $15-20 - will this class of domain name go up in value? I believe so and I think so do many others. I would expect that sometime next year the wholesale value on a LLLL.com with decent letters will be closer to $30