That's also a good point, I think if more people knew what they where going to be getting from a pro GM, then more people would be open to it. But the definition of what a pro gm brings to the table should be presented by you, what sets you apart from what they are use to
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Me, I'd charge $20/hr with a minimum of 4 hours, so I'd make $80 at least. That would be for a group of 1-4 players, with an added $20 per player after that. (so in your 6 player, 4 hour, scenario $120)