Do I know for a fact she was getting money from him? No, I didn't see money change hands. Yes it is my assumption based on what I have read about their situation, my incredibly expansive experience with people in society, and common sense.
Fair enough. However, I too form opinions based upon the same above criteria you have mentioned.
I too have an extremely expansive vault of experience with people in society, common sense, and when coupled with insight you could not possibly have, I believe my realm of possibilities may be a bit more fair & balanced than yours.
I have been a hot 20 something woman. I've known many hot 20 something women, ...and I can tell you right now, the conclusions you draw are not necessarily the case.
I guess it's possible he didn't give her a dime. That his wife just invented the claim that she was given $1.8 million in cash and gifts. That the elderly Sterling often gets to sleep with young women like her without giving them anything. But you have to believe things like the government shot a missile into the Pentagon to believe something like that.
Yes you would, wouldn't you?
Wow, you can be annoying sometimes.

She was his hooker. If he was Donald Sterling the Burger King employee, she isn't going to sleep with him. There isn't a hill of beans difference between her and the women standing on the corner on Sunset Strip in Hollywood. She just gets paid more.
If he was Donald Sterling the Burger King employee, he possibly might never have met her.
Don't get me wrong, I'm not saying their relationship was not without it's benefits. But if she was dating Donald Sterling the Burger King employee, and he gave her plenty of french fries on their dates, ...and he deployed his Burger King employee discount to reduce her bill, ..or he let her have it her way... would you call her a prostitute?
How many guys who work as mechanics give their girlfriends free car repairs? Does it make their girlfriends prostitutes because they are the recipients & beneficiaries of the amassed skill & acumen of their boyfriends? What about their Moms? God forbid they make sure they take care of the regularly scheduled maintenance and occasionally look under the hood. I'm sure Rachel Ray's husband was never called a prostitute for being the recipient of incredible meals she prepared prior to their marriage. Don't put me in a position where I'm drawn into defending Sterling's actions in his relationship. I wasn't a part of his relationship with her. I just think it's rather sexist, as well as cynical to automatically characterize their relationship the way you have chosen to do.
If she was homely, not what has "traditionally" been seen as attractive, ...would people automatically be jumping to these same conclusions?
The fact of the matter remains... self-made Billionaires, don't rise to the heights they attain, ...especially from such humble beginnings, without bringing something to the table. Men like him have an internal spark inside of them ...a fire in their bellies that can and does attract young women like moths to a flame. They also know how to compete against the young 20 something yr old guys who most often are intimidated to even approach a woman like Stiviano. They don't compete using the same stale, tired weapons deployed by the 20 somethings, the same tired lines and approaches she hears everyday... no they complete on their own terms, using their own weapons, tools, and strategies. Yes, money is a tool on their toolbelt that they deploy, ...but it's a tool that affords them the ability to deploy strategies, and play on a whole nother level, and in a whole separate league.
If you've never been a hot young 20 something swept into another realm of existence outside your paradigmn, into a world you never knew existed, you might cynically succumb to the view that she is a hooker, and that the only thing a hot 20 something could see in a 80 something Billionaire is sex for money or money for sex. I'm saying it is possible for an attractive young 20 something woman to have a sincere attraction to an older Billionaire, ...especially one who lets her have her cake and eat it too.
PS: Stop drawing me into a position that on the surface appears as if I'me defending that decrepit racist.
I'm not. He looks like the freaking crypt keeper. I just don't think it's right to sit around and allow people to malign and assassinate the character of Ms. Stiviano without all the facts, based on nothing but conjecture & speculation based solely on her appearance, and the fact that her boyfriend is a wealthy tortured coward.