I've just completed my 2nd "long term" arrangement from SA. First being 10 months and the last one was 8.
Few things I learned -
Girl1: You want genuine attraction. Best girls are the ones in their mid 20s at the end of their "slutty days". This girl seemed to admire me a lot, and by the time our arrangement ended, I could see a lot of improvement in how she selected friends, her thinking, etc. She was a bit on the pricey side. But 200% worth it. Responsible, never ghosted even once. We did just about everything (travel, events, mini-trips, dinners, coffees, sex was amazing). After we broke up she wanted a clean break, which is always nice. I've seen her once since and we both agreed not to re-engage. Experiences with this girl were really well balanced with sex/activities. I could write a book about the fun. Will be hard to replicate, but we'll see.
Girl2: This girl was in her early 20s. Also respectful, never ghosted, always presented herself very well. In terms of ppm this girl cost almost nothing. I'm not going to reveal what I paid her in ppm because, frankly, none of you will believe it. But like most arrangements, when the menial amt I was paying her stopped, shortly after the dates ceased as well. One thing about this girl is that the sex was something else entirely (from the first girl). We would go at it for over an hour I could see she really soaked up the experience each and every time.
Moving forward, not too sure if I'll do another one or not. I've done quite a bit of vanilla dating as well, and what I've observed is that the time + money you spend on finding a vanilla girlfriend is insane compared to the menial $ you pay in ppm to skip all of that bs. The price of a dinner for two + ubers, is pretty much what the ppm winds up costing.
As for SB vs. Escorts. I've found that the Escorts I've connected with are more mature than the SBs. They're more honest and they are fulfilling a goal or duty. Wheres the SBs - not just the long term ones, but all the ONS ones I fucked - were mostly confused and "figuring out life" and the money they collected from me went to pay for silly stuff like tuition, credit card payments, etc.