Well.
Non-Geographic-Numbers.com is getting no visits according to Alexa, Compete and all other stupid traffic calculating sites.
And a domain with two hyphens and very long RARELY has little value, i mean, look at free-credit-cards or something similar, then YES, there is value. But it's not the case of your domain name.
Even if you develop i'm afraid it wouldn't increase its value too much.
Other domains, co.uk ones, could get some end-users interest, but they don't seem to have good chances at me.
And.
You may not like honest and cruel appraisals, i understand you want to read your domains are gems and beautiful and very expensive and you can earn up to $xxxxxxxxxxxx from them, but here 99% of users will give you honest appraisals, and most of times they will say "reg fee" or "$0", because if you have a GOOD domain, you don't really need to post here to know.
My two cents.
pberry4032 said:
Hmm, do you know what you're doing?
Was there really any need for a reply like that? These domains are ones i've had for a while and the NGN domain you mention get's a lot of natural hits due to the phrase. If developed i've absolutely no doubt it would get decent business for a reseller of non geographic numbers. Do you understand what they are??