The question posed in the title differs somewhat from the behavior described. I've known people like that, and they are terrible people, and when I say "people" I'm using that generously - they're much closer to automatons. This one guy, if you talked to him about anything other than the acquisition of wealth or the acquisition of womens' lady bits - would give you a blank stare, take a second to reboot and then begin talking about one of the two aforementioned topics. They differ somewhat than the prototypical "cut-throat" business people. You know, those people who justify their behavior with faulty circular logic: you have to be ruthless in business, because business is ruthless. _Rarr, I'll eat your company_!
Like orangecat(http://news.ycombinator.com/item?id=1184986) mentioned, they exhibit classic sociopathic behavior. To be fair, we all use people - you use friends for friendship, significant others for significant-othering. However, it is the complete lack of empathy from these sociopaths that makes their behavior abhorrent. Though we all use others, the implicit social contract that is normally entered keeps the exchange amiable.