I set up a one-person goal and have been informally blogging about my decluttering goals…

While I’m thinking about it, I suspect your collecting rule only applies to things that are “collectable”, like figurines or comic books. You can use your rule on things that already have a market, but it doesn’t apply to the things that no one is actively collecting. My bf collects vintage tin robots. The early collectors got in when there wasn’t a market and you could buy the toys as toys at yard sales for a buck a piece. Once people started to want the toys, the prices went up, but people had to keep the toys in their attics for 20-40 years before the market formed. The scarcity drives the prices higher. I wonder if there have been any statistical analysis of “antiques” and collectibles…