My sad little spreadsheet tells me I have spent more time with my beat up pair than most of my actual friends, which says way more about me than the headphones. That tape job on your headband is basically a badge of honor at this point, and new gear just does not have that same worn in feel. My old pair sounds wrong to everyone but me, and honestly that is how I know they are mine.

Figured oil would make a mess, but it works great.

800 labeled images is the catch though. That guy in Tucson didn't just grab a 3B and win, he spent weeks labeling wiring diagrams. Most people don't have that. I ran a small model on invoice parsing for a while and it fell apart the second a vendor changed their layout, while the 70B at least guessed right on stuff it had never seen. Speed is real, sure, but a tuned model only knows what you taught it and that bites you later.