As someone who spent a big chunk of time in 2021-2022 trying to get rid of boardgames I don't want anymore, there's a lot working against reselling used games.

As someone who spent a big chunk of time in 2021-2022 trying to get rid of boardgames I don't want anymore, there's a lot working against reselling used games. It's a market where outside of the top ~100 games, a specific product can be hard to find for an individual even when shipping works out. This is also why math trades are popular - but 2020-2022 made popular venues for those more difficult too, and the breadth of games means that while any given math trade is going to contain some hard-to-find games, it's probably not going to contain your hard-to-find one. It's also a market for lemons. Lots of resellers don't even know if they're missing a critical piece, which printing/edition they have, if expansions are included, if it was a counterfeit to begin with, etc. Buyers have little way to distinguish people who know what they're selling from those who don't without lots of time investment. This also discourages market-makers from helping solve the logistical problems.