I have participated in this fetish (on the giving end.) In the BDSM community it is referred to as findom. I can get extraordinarily aroused by giving my money away or buying something and getting nothing in return,but the girl should have a certain personality to excite me in that way, preferably bratty, conceited, and manipulative. She should not thank me, but take pleasure in using me.
Thankfully I am not as aroused by this as I used to be, as I don't make a lot of money. I make pretty much minimum wage but I still love blowing my money on sexy girls. There are probably thousands of girls doing this online and there is no shortage of guys into it. My only problem is that I feel like I'm not giving them crap if I don't spend over 100 dollars at a time, as many of these girls would consider a 50 dollar gift card to be small change, and they have hordes of men willing to give them more, or at least I feel that way. fifty dollars is about what I make in a day though, after taxes.
I've never thought anyone would actually be aroused by receiving money/gifts.
ElKahn wrote: as Graveyard suggested, it's not ok to take advantage of people, so you might want to moderate yourself.
Some men love being "taken advantage of" and I say that with quote marks because it's not really being taken advantage of if you love doing it.