Agreed with htmlindex. Without being relevant, you may make a handful of $$ here and there, but I doubt it would be worth the time and effort.
For every 3 to 5 LLLN or NLLL.com's register you could use the money and buy a decent LLLL.com on the aftermarket. That's what I would do. Unless the LLLN or NLLL.com has a good possible meaning or bradability.
If you would like to create website I think it can worth but if you wish to just sell the domain name I don't think it worth unless they've really good domain name.
As said before dont waste your money ont hem unless they are really good! I mean 4L.coms are finding it hard, unless you are prepared to wait 5 or more years otherwise dont bother IMO.