Accidentally made $527 from a small GPT thing i built, still not sure how

Keeping it short, i was annoyed at my own AI workflow. same grunt work with prompts multiple times a day so i built a small wrapper around GPT that fixed my specific problem. It was something that stopped me typing the same thing 40 times a day. friend saw it and said people would pay for this. I didn't believe him but yk still worth a try spent two weekends cleaning it up enough that a stranger could use it without me explaining everything, put it on Gumroad at $17.