Playing music. Started on a shitty hand-me-down acoustic guitar. Got a better guitar. Got an electric. Got a better amp. Got a couple of pedals. Got a better amp. Got like 6 more amps, some cabs, 5 more guitars, a huge pedalboard, a cello, a keyboard, an audio interface, attenuators, mics, etc etc.
You gotta understand... I need all this stuff. There are subtle differences that you've never noticed before but will probably hear once I do an a/b comparison for you, and I absolutely must get an AC15 next to round out the collection instead of buckling down and recording something.
I spent a decade as a touring musician. My guitarist is still a tonechaser and has new shit every practice. New amps, New pedals, etc. He's constantly trading and saving for new crap
I'm so happy I run my PBass into an OCD clone voiced for bass into a Mesa 400 with 2x15 and I've never wanted more.