I have listened to free ones and as long as the main speaker (being you) speaks it is interesting.
But as soon Q&A starts it becomes often boring since some Q other people are not interested in or they already know the answer and some people dominate the questions.
I don't think people would pay $90.
May be you could do it with a small group of people and let them know what you are going to discuss. I think the
price might still be a problem.
What has been done on CZ is answering e-mails for a fee.
Or a 15 minutes telephone conversation (with you) for a fee.
E-mails is very time consuming and may be you need almost
to dictate the answers to someone else, but you can record it if you have a few minutes available.