"I'd put it at around $15."
I can second that, llll.nets just are not cutting it these days, but that's not to say that they are not a great investment, when everyone else is selling anbd prices are low its the best time to buy as with anything. Hold on for 12-24 months and it will be a completely different story.
If you look back at NP threads 12-24 months ago and see prices of some domains and now look again now you would wish you had bought (or not sold) then.
Personally I would suggest holding on to your LLLL.nets and waiting for 6 - 12 months as I am sure they will go up.
typos are only really great if it's for the .com rather than .net (IMO)
Hope this helps.