I believe it's a good step taken by coinmarketcap website by excluding the Korean price from the pricing average while still counting the trading volume. The disparity among Korean price and rest of world price was required to take out from the equation for a realistic bitcoin price. So a good step taken for longer term.

Exchanges like bithumb or coinone was experts of inflated price and fake volumes. Taking them out of the equation will help traders to speculate more accurately.