Well if they were .com, I would say a minimum of $500 each, re-sale. Lately I've been telling myself that LLLL.net's are currently at about 1/15 the value of the relative .com name.
That is just my number I use to help me when reging LLLL.nets, people will surely disagree.
Prices will always vary and should continue to increase as long as the LLLL.nets continue to be reg'd and LLLL.com's continue to be held.
So I would say you could probably get around $30 each, currently, to an investor, more with time just like the LLLL.coms.
I don't know if I am over or under on my estimate but I think I'm close.