I'll give my 2 cents...
I've been on SA for a few months now. I've found of kinds of girls... around 60% of them will say X amount PPM (90%) or monthly allowance(10%). In that 60% about 2/3 will say they need to feel comfortable with you to have intimacy (unlike escorts who won't have a choice most of the time), and 1/3 who don't care about how they feel towards you and are straight up PPM intimacy type.
The other 40% is a mix of everything, curious girls who wonder what the site is about, girls looking for hit big (rich partner to marry), others use it as tinder but are attracted to mature guys, etc.
I met 2 girls only, none of whom I gave any money for the meet. First girl, paid for restaurant and that's all, nothing happened, just a good bye kiss... I think she's the kind who doesn't sleep on first meet, especially if no money is involved. second girl, I paid for restaurant and hotel.. something happened obviously and no money was given. I haven't contacted the 1st girl since because she's not my type, though I would fuck her if I am out and having fun with her, she is fun. the second girl, she's been wanting to meet again since that first meet and it'll happen. She's a 25 yo Latin chick who's got high libido and a sense of adventure and is not looking to make money out of this arrangement, she just wants to enjoy her time and learn all kinds of things from an older guy as she is tired of guys her age whose only topic of discussion is tiktok and how much booze they can consume.
In both girls (and ones I haven't met), I find it's a lot of time invested as opposed to MP/escorts. I use protection and don't expect those girls to see only me as I can't see them that often anyways, I make it clear to them.