At this precise moment in time, I would not expect more than $10 for these domains to sell. However, as with 3 character domain names, when NLLL are all gone, they'll be worth a lot more!.
LLLL.com is far more valuable than LNNN.com, cache.
LNNN.com have no standard value right now...because nobody wants or needs them. Not to mention there are very few registered and you can just go out and register the ones you need yourself...