I think my girl friend "scams"(?) old men out of money.

Ok so just to start off, not really a serious relationship, just like a for fun thing. Anyway, she just told me that she has like 3-4 guys in America that send her money so she can pay her bills and stuff. She actually has a decent professional job already, like I think she makes more money than me, which isn't a lot but still. No, she's not a bar girl or anything like that. I'm not sure if I should feel sorry for these guys in America but like wtf are they really thinking? This girl they met, (who's like 20 years younger than them) on vacation is really going to be "the one"? Or if I should be mad at her for taking advantage of lonely men in another country. It's kind of crazy because I figured this kind of thing happened but now I'm witnessing it first hand. I'm pretty sure she is using the money these old guys give her, to pay for our vacations together. I haven't paid for anything except for like a few things at 7/11 here and there. I'm stuck between the morals of, this is kind of fucked up vs they should really know better.