I have never used such exchanges, I do not see any sense in the fact that they need to be used.
I am sure. that they are no better than the usual, popular exchanges, so the use of such exchanges seems to me just for us a common waste of time.
Well if you participating in ico and after the icon the token will only be listed on an korean exchange, I am sure you'll start considering that they need to be used to trade the token you already bought on ico.
It happens anytime. When you don't get your token listed in major exchange, having account in such exchanges are sometimes useful.
you have to deal with the fact that not all the token you loves are being trade in popular exchanges.