I'm not sure how well these names will sell for undeveloped.
Thing is, people buy .mobi's as if they were regular .com's and so forth, forgeting the main use for a .mobi (cell phones)
Now, builders.mobi and pilot.mobi are honestly :imho: not worth much un developed. ((An idea for builders.mobi could be a realestate agency, to locate homes for sale/rent in a persons local area) and as for pilot.mobi, a nice Gen dn, but what could it be developed into? (maybe a flight schedual and so on for people traveing or something along those lines.) But as names alone, i don't think you'l be able to sell them for much.
VideoMusical.mobi is also a tough one to sell, BUT if you contact some of the (spanich/latin) related companies in the music industry today and juggle around with this name, you might get some offers, or someone may pick it up because it sounds alright.
I would say VideoMusical.mobi would make you a high $x,xxx is fold to the right end user, or a low $x,xxx - high $xxx to your average .mobi buyer.
Good luck either way.