I see session of $10 to $30, which seems really low to me.

Your audience are basically guys making plenty of money and not afraid to spend it. I know a few guys who spends tons of money on Games Workshop kinds of things, buying even more than they have time for.

So I was wondering why are your prices so low? I would think the lowest price would start at $50 or something.

Like everything, price is set by supply and demand. I'm pretty sure the demand is there. So are there so many great GM's that flood the supply?