As someone who has multiple times heated up my soldering iron and realized it had the <big|small> tip on it when I needed the <small|big> tip, and then gone through the annoyance of swapping tips on a hot iron, I can think of at least one thing to do with two irons.
But over a lifetime of things breaking, you'll get a lot of large quotes for professional repairs, or replacement of a much bigger part than what actually broke.
When the washer fluid sprayer on my old Tacoma failed due to decades of a wire rubbing against a sharp metal edge, I was quoted $300 for the whole harness, and 2 hours of labour at $100 an hour.
Suddenly, the $120 soldering iron didn't seem so expensive.
tldr: I'm only 30 and own thousands of dollars worth of tools, but at no point have I ever spent more than the quote to fix the problem at hand.
I still use the cheap soldering irons, carry about a dozen different ones for different occasions in my truck in a travel case.
One of the most challenging was a fish-finder on an offshore boat where the very expensive underwater sensor was just fine but it was only the business end of a long waterproof multi-shielded power, analog, digital cable which was what the marinas replace whole-hog when somebody ends up with the cable caught in the propellor or something like that.
Can't bring that kind of thing to the bench anyway.