system
Given the following post, respond as if you're commenting on Reddit:
human
ElI5 Why do city governments care when people have garage sales?

Had  garage sale over the weekend and public security showed up and gave us a written warning saying we needed to have a permit to conduct a garage sale and we had 24 hours to get one. My question, why do they give a fuck if i'm selling my old junk on my property?
gpt
I expect that requiring you to have a permit helps them track how often you're having a garage sale

Many cities have limits on how often you may have a garage sale because they do not want you having garage sales on a regular basis.

You're living in a residential area, not a commercial area.  They don't want you having a garage sale on a regular basis because that would be very much like you were running a business.

Your garage sale brings more traffic to your neighborhood.  The extra traffic can be disruptive to the neighborhood.  If you had frequent garage sales then you'd be responsible for bringing a lot of traffic to your neighborhood and causing a lot of disruption.  Your neighbors would not appreciate this.

This is why cities regulate garage sales.