Currently reg fee. But once people catch on the numbers are more suitable to .mobi than perhaps any other domain, this will do well. Numbers that have alpha meaning will do better (like 3627=DOCS).
By the way, less than 2400 NNNN remain.
As for the .us and .ws...zilch. No market. Unless you brand it and market it yourself. But I do not see the application of numbers here as I do with the .mobi market.
Sorry - just because someone is posting how "rapidly" NNNN.mobi names are being purchased, doesn't make them more valuable. You can practically come up with 4 letter words (or meanings) for most combos. Sorry.

The intent of that posting was to make interested parties aware of the decline in numbers for the NNNN .mobi market. Not every one has to be in agreement on this. Many people are not big .mobi fans. I do not own a boat load of them. Less than 20 perhaps.
But some numbers will be more brandable than others and some will be more marketable. Sorry, if someone needed a doctor, well DOCS.mobi is gone. The alternative to that is 3627. Unless your mobi device is set up or you proficient on the text messaging, you'll probably end up dialing 3627 anyways...unless you need 911
