Price is really key! For myself, a lot of the time i tend to try and avoid the hype / overlook resellers looking a mad price for highly in demand shoes or products. These posts and groups stand out for me within the second hand market. Individuals looking to trade/sell the items they own second hand with around (8/10) wear & a dropped price in mind. Someone buys, doesn't wear as much as they thought they would, sees something they might wear more?, sells on to someone else on a budget they can afford.
Everyones fashion taste is evolving and this idea of the 'two lunch tables' working together, buying, wearing, selling on, especially with high end products is enabling more and more people to get into the GAME! Focusing on this second hand market would be ridiculously useful and really pushing for an organised 'want to buy' community would be a game changer. Just got to have an influx of sellers onboard who aren't looking to resell for retail (or higher)