To get j+u+v you need to press 5, then 8-twice [pause] then 8-three-times. So I think the placement of the letters is bad. The best letters in .mobi are the single press ones:
A, D, G, J, M, P, T, W
Then again, most of the .mobi crowd jumped into it not having the cellular market in mind but rather the availability of a new TLD. They register "HolyCrapRealEstate.mobi" thinking it has value.
For that reason I see a value less than LLL .biz range e.g. $50 - $150