You're describing old-style matchmakers. I paid one about $200 circa 1998. She promised matchups every month until I cancelled, more or less. She wanted me to

You're describing old-style matchmakers. I paid one about $200 circa 1998. She promised matchups every month until I cancelled, more or less. She wanted me to match so I'd quit draining her time & effort. Within 3 months I had a girlfriend, and we both dropped out. We had a grace period where we could re-up if it didn't work. Obviously, if one of us cancelled and the other asked for more matches, that deceipt would have been quickly revealed. In short, you paid a larger finder's-fee upfront, and the service is motivated to match you ASAP.