Teachers, should they charge?

[alien]

Would you expect to send your kid to a piano teacher and not expect to pay?  What about going to a psychologist?  A doctor?  Lawyer?  Where does this idea come from that says spiritual teachers don't need to pay the bills like everybody else?  If someone asks me a question and I can answer it quickly and succinctly, that's one thing.  But what about when someone wants a teacher to spend hours and days and weeks and months and years instructing them in one thing or another? Is that fair to the teacher OR to the student?