Why are people selling their Korean boards? Something better coming?
Some people are over them, some people own them and think they're overhyped, not worth it, and are happy with a $100 board, some are Topre converts, some have money issues and have to sell them, some want to try something new and different like the Kingsaver, and so on and so forth.
It could also be that there's a bubble with Korean keyboards like I'm sure there is with Clacks. People see all these awesome metal cases coming out domestically and cool domestic or more local keyboard projects and don't really see a reason to go with the more expensive Korean keyboards, especially when the market is starting to be flooded with all these other awesome options that also happen to be cheaper than a Kmac and the like without being any lower quality.
