That would be my concern for this business. It'll disappear instantly when they do (and it's got to be a when, right?) but he's getting good value for moving quickly. Or maybe they get acquired.
You’ve got a good niche and I have to admit I’m envious of the position you’re in—that level of autonomy seems rare.
It’s also a stupidly great idea for non-technical trade and craft shows. No infra or complex setup needed. Smart. Well done.