Thanks for the link. That actually raises several good points I'd not thought about.

For example, if I start paying them, would not only their expectations change, but would mine? Would I start feeling they owe me their time, and would they feel obligated to give me their time? I don't want to impose this upon kids that are going to high school or college, at least not without prior experience of imposing this on paid professionals.

I've always made it clear that their school and real life priorities remain above those on ACC. But I'm not sure this mutual understanding would remain if we cross the borders from social norms to market norms.