I'm an IA, and have been doing pretty much all of my own MX for nearly a decade. I find that the guys like myself who don't have to pay for labor have the ability to fix just about any nitnoid write up that comes up. I personally like to write up everything that I can possibly find during the annual. I fix any airworthiness issues immediately (of course), and then I fix everything else on the list gradually throughout the year. By the time the next annual rolls around, it's harder to find things to fix.
I also like to refurb entire "systems" rather than just one component. Case in point: I recently had an issue that presented itself as a weak charging indication during a night flight. For the price of what a normal owner would have paid for just a replacement alternator I completed the following items: New Battery, New electronic voltage regulator, inspected all wiring and switches, removed and completely overhauled the alternator (new bearings, brushes, field coil, rectifier, seals and hardware), completed a Continental 500hr SB on the alternator geared coupling. Reinstalled with all new gaskets and new hardware. What would that cost a normal owner? A couple AMUs, it cost me less than $600.
Do some mechanics fly junk? Sure, it happens. Do most of us do lots more than the bare minimum, most definitely!
V/r,
-Dana