Be sure the painter or custom paint shop deals with motorcycles. If they mainly do autos, you will probably be put in a corner and used as 'filler' for when they have nothing to do. Do they have actual custom motorcycle paint jobs 'in-house' they can show you?
Also, is a majority of their work shown on ice cream makers, golf carts, toilet seats, mail boxes....?
Could it be that they use these to gain experience to actually do painting on motorcycles?