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Feeling proud of myself. A big university wanted to vet me for a potential program in the future and so requested a visit outside of my posted hours. I told them a private tour is $10 per person (or good faith agreement to buy something). I'm trying hard not to say yes to everything.

Right principle, but wrong amount/approach, imo. Asking for $10 per person makes you sound like a tour guide, not a pro. Better would have been to say, for example: "My professional rate is $250/hour, though I could charge by the half hour. Shall I book your group for 30 minutes or a full hour?"