The .us extension has proven to be a dud. It is almost as bad as .biz. I told people a few years ago that they should NOT fall for the pumping that a few well-known websites and domain journals were doing with the .us extension. Their asinine arguments were that there were no good dotcoms left so businesses would have to buy .us. That is not only 100 percent wrong, it was also dishonest and immoral, as those pumpers owned a bunch of the .us horseshit.
As it turns out, those who invested in .us are now bankrupt and humiliated. Basically, all you need to do is stick with dotcom. After you make a few hundred thousand or half a million buying and selling some dotcom names, then if you want to branch out into dogshit then be my guest.
Do NOT trust anybody who wants to sell you anything, let alone names in virtually worthless LOSER extensions. The domain world if full of scams. Just about every single so-called trusted entity or website has been involved in serious fraud or dishonesty. I used to bust these clowns all the time, and they tried to throw me out, but that is what scammers try to do. Think for yourself. Look out for yourself.