Putting out ads for test subjects that have certain preferences out of the box

Basically, you have a system whereby you can put out ads for the cost of money. The more preferences you specify, the more it costs; maybe the first three cost some flat rate, but every one past that gradually costs more and more per preference. You' could spend more on the add to try to get more volunteers, and they'd be paid as well. But ... it would give the players another avenue to spend currency, give them subjects that enjoy the same things they do with a sense of determinism / less of a sense of RNG, and be contextually relevant to the game's world.