LLLL.net's aren't really worth investing in, buying a nice LLLL.com for $100 would be a better investment.
Worthy of reg fee? Possibly. UNGT does have keyword trends. Why do people say "not worth anything?" Any reason for it? I'm against people telling something isn't worth something without a good enough reason. I'm also against people saying something is worth something without giving a good reason also. See if you can get it developed/up and running. Too tired to do more research on it, but it does have trends. I assume it might actually mean something in Icelandic. http://google.com/trends?q=ungt
My advice is not to waste your money unless you plan on sitting on this name for many years for prices to increase.
When you search UNGT on Google you get 1.8 mil. returns and this thread is number one.. lol Also it apparently is the absolute indefinite neuter form of the Swedish worth Ung which means Young. It's ok if you don't mind holding the name for 2-5 years for a decent return. 4L.nets are heating up and I think that they have a decent future. Just try to stay with the premium letter/pronouncables that are reg'd in other extensions with decent SE results. That's my advice.