One major drawback is that most good promoters require the artist/artisan to be present at the show. Now I do know of one person who is handicapped and she did hire someone to work wirth her. She is still in the booth but the other person does all the work. Setting up, selling, etc. But as long as she is present, she fullfills all the criteria.
Hiring someone in another area to sell your work means they are "reps" and again most shows do not allow reps.
Read this: There's NOTHING at an art or craft show anybody NEEDS. Nothing.