You suck all the dopamine out of something and move on leaving the drained husk of your former hobby behind. Hopefully the dopamine runs out before you put money into it.
I swear as soon as I put money into a hobby, I lose interest. I got a guitar I can't play, a hackRF I can't be bothered to relearn, a box of half built eletronics, an unknown amount of Raspberry Pis and Arduinos with no purpose...