I have some personal experience with this. I think what you are trying to do is commendable. Group therapies are also pretty expensive and not accessible for most people except in extreme circumstances.

The thing is if you're having say, 10 people for a 1 hour session, that gives each person about 6 minutes to share. But really more like 4 - 5 minutes after overhead. I think that is still worth _something_ (12 dollars per session sounds about right, edit: you may be able to go a few dollars higher), but you are basically trading off quality and cost here. It's going to be hard to actually build a connection and make it meaningful.

(edit: to be clear - the cost here isn't necessarily the lever - whether you charge 5 dollars per session or 25 dollars per session - you will need to make the 1 hour meaningful for the 10 people who are in the meeting, which will be the hard part IMO)