Yikes, I hope you're joking! The cost of manufacturing consumer electronics has gone down so much that it's virtually impossible to have a viable repair business in the US - perhaps high-end laptops, Apple products, and very straightforward, limited repairs like phone screen repair, but that's about it.
As another anecdotal data point, I volunteer in a thrift store, and by far the hardest donation to sell is electronics - most of the time we just trash/recycle it, even if it is in very good condition. People aren't willing to pay very much at all for tech that is even just a couple years old. Thus, if the average age of a piece of electronics needing repair is, say, 2 years, by that point the product will have probably depreciated most of its value. At that point the vast majority of people will just buy the latest and greatest.