For my business, if I feel the tutoring session was not very productive, I won't charge my student. I do this for two reasons. One is that I don't want the student to feel bad asking for a refund. The second is that I don't want a negative review on my Wyzant profile. At this point, I feel established enough on the platform that I don't worry about a negative review. But I still want my students to be happy, and I am sensitive about whether the session went smoothly and provided real value for money.
When students have vetted me like this, and they've sent a sample of the work they are trying to do, I have been able to honestly assess whether my skill set is a good match for them. But for this to work, you have to be pretty specific and transparent about what you need. Sometimes that's really hard for a student to do.
Is it wrong to meet with a tutor and then figure things out? No, not at all! But I want you to understand that it takes time for a tutor to figure out how to help you. It's not a bad use of time, but it does take time, and that's time for which a tutor should be paid.