To me it feels a bit dangerous. They get pokey and rough enough with just their hand- I shudder to think of them having a device to press too hard against me or poke me with. Not to mention- that’s using up more than their allotment of wearing me out for the day.
If a regular wanted something used on him, and I felt comfortable with them and the situation, I think I’d charge them a premium, buy a $20 version on amazon, and toss it in the trash afterwards.
But to use on me? Nooooooo thank you