This is certaintly not a bad idea. Unfortunately there are precious few folks out there that have the skills and marketing savvy to make this a reality. Just trying to find a qualified tech to work on a machine in ones home without having to haul it out is a major challenge. With the advent of this avocation for the folks who have a few bucks in their pockets it would be a great opportunity for a number of folks to start offering in home pinball repair. Charge as needed to make a reasonable profit.