Conversely, go the harbor freight route. If you use it until it wears out then upgrade.
If you have a faulty wrench you'll strip your bolts and turn your next hour into a nightmare. It's objectively better to get a small set of essential quality tools and expand your game later.
I don't know how much money there is in fixing things though?
Well, there are still things that are worth repairing and need constant maintenance, like bicycles and guitars. If you specialyze you'll always have clients.