Honestly Forums are quite laborious and hard to keep going. I'm comfortable here cos I was around at the start of the internet and we were all dialing into the network. Almost everything was on a forum of some sort. Nowadays Instagram is much more efficient BUT forums are, to be fair, a better way to buy and sell and build a collection! I personally don't see an issue with people using the forum to sell and then move on.
The serious collectors will however still sit around in the shadows, some will comment but most will just observe. Pick up where they can... sometimes sell. Very typical Asian behavior.