And what the rest of the world does. Patience getting in the way of making more per hour than you will ever get paid in the real world. The $150 I mentioned above was what I essentially paid myself on the first one, after that and knowing how to second time do it much faster I make double that or $300/hr.
That's nothing, many parts I have rebuilt to use over again and up to $2000/hr. self-paid roughly when I 'rebuild' an ATX by simply reshimming say a clutch piston or band when the usual norm is to get a new trans. I've done that more than once on more than one type.
I rebuild $200+ alts all day long at $50 max cost for the regulator and have rebuilt them to last years more for as little as 30 cents for simple solder, or nothing in a couple more cases. Lack of patience will stop 100% of that. FREE MONEY. The ones I rebuild last so much longer than what you can get OTC now it's not even funny. When I sold parts 20% of the new alts failed right out of the box and onto the alt tester and included the best most expensive ones we sold. Utterly ridiculous.
Just R&R'ed a/c system on one car for nothing more than the two $5 cans of refrigerant and it freezes my butt off now. Rebuilt the clutch, flushed compressor, and cleaned orifice tube.
Not only that, when you replace with the same exact quality part that failed before, you have also locked in the same failure rate. Many of the things I fix have the major fail issue repaired to not fail nearly so fast as the brand new OEM branded part will, I do it all the time. When you can pick up the new part and tell where it is going to fail before it even does that gets pretty easy, I do that too. The engineers that design much of this stuff now are incompetent as h-ll in my view, OR they are intentionally misdesigning parts to make them fail early on purpose (for higher parts sale throughput, with Ford it has become an art and a huge profit booster), the two choices you have there. Like window regulators that fail every one (4) in less than two years, I rebuild and they stop breaking but then I change a couple of very small things. $75 each and fixed using maybe $5 worth of non-OEM parts.
Lack of patience is what empties your wallet. At least in my view, but then, I was NOT trained 'in the box', so my view differs whoppingly from the conventional view. Why I haven't let 'conventional' mechs touch any of my cars in 45+ years. They waste way too much of MY money.