I tried this for a couple months too and was always comparing it to what I know is available from Escorts. Essentially I like I assume a lot of guys are looking to get some variation of more for less.
I chatted with a lot of girls and ultimately met with 2:
-One was a young college student, 21 I believe who does this on the side while in school. She was very forward and direct, offered PPM and didn't ask for a second meet, just said "lmk if you want to meet again"
It was $500 plus I had to grab a hotel, we had great sex, chatted for a while. Altogether 3 hours, cost me $650. I could have gotten the same or similar with an SP, but the allure of someone new was exciting and it was exciting to meet someone who was not an escort (although I would call her an Escort-lite or Escort in training). I could tell she wasn't a pro because her boundaries were different.
-2nd one was more interesting. A bit older, closer to my age which was nice. Mid 30's I believe. We chatted and she said she was ultimately looking for an arrangement but was willing to start with PPM.
We had a nice chat and I treated her nice, didn't ask for nudes, didn't get explicit day one. She mentioned how I "deserved and award" which tells me most guys are dogs on there.
Anyways my patience was rewarded nicely. The next day she sent me a tasteful nude, which led to some flirting, which led to 2-3 days of some of the filthiest dirty talk I've ever engaged in while we waited for our date to arrive.
She sent nudes, told me all the things she wanted me to do to her, and let me tell you this girl had very little boundaries. In fact she hit one of my boundaries, but I never hit one of hers.
We met and had really hot sex. Probably some of the hottest, sleaziest, crappy motel sex that I've ever had in my life.
Problem is I felt like she was actually digging me as a potential partner. Kept gushing how she felt like a schoolgirl etc
As stated above, some of these girls have rough lives and this one was no exception. She came across as sweet on text but was loud and brash in person, kept talking over me etc
Safe to say the post nut clarity was strong on that one. But still that sex though....
But ultimately the reason I stopped is because I realized that I like the clarity of SPs. There's no confusion on what it is
With the SBs I felt a bit conflicted. It's almost an adversarial relationship. The girls are almost all hoping for ongoing relationships, whereas I (and a lot of guys) only want to PPM and/or treat them like a new pool of escorts
I don't want to lie to anyone about what my intentions are, I'd rather just be upfront
If money was no object or if I was planning on staying in transactional relationships for longer, I might stay active and meet the odd girl who is perfect for me. It is exciting no doubt and provides a little of the "thrill if the chase" that you get in real dating but not in SPs.