I think it's a great idea, just don't know how practical it is. While I would think most hobbyists would like to work in a shop attended by people who can help when you hit the inevitable brick wall, bringing in a machine makes it a much more difficult task. How many repairs would the ninja have done if all those people had to bring their pins to him? . So, as others have said, volume is a challenge.
I think, however, that the biggest challenge in a setting like this is liability. Joe Blow sets a desoldering tool down in the cabinet, where it topples out of it's holder and starts a fire. Scorched cab is no big deal, but what if that's the day that Clay has special guest tech 'Candy' polishing shooter rods in her own special way, and nobody notices the fire until the game is destroyed and the building is fully involved...?
Producing videos or webcasts? Now there's an idea. Maybe it's time for the ninja to go live streaming.