My Mom loved garage sales, both buying and selling. She'd go "garagin' " on the weekends with my Aunt, and come home with a carload of crap she couldn't live without. Stuff would accumulate until she decided she needed to have a garage sale of her own. Then she'd spend days setting up a sale, washing and folding clothing, cleaning up knickknacks and whatever, then labeling every item with a sales price. She had no idea what she had, or whether things were worth anything. On the day of the sale she'd throw caution to the wind, made crazy deals with people ("I'll let you take this entire box of clothes for 50 cents!") and at the end of the exhausting day, might make twenty or thirty dollars.
I never saw the point of it. I dislike buying second hand (except timeshares.) Once I'm done with something I don't want, I'll give it away. Come to think of it, I do that with timeshares, too.
Dave