I don't know. Why would price be higher there? To me it seems obvious that it is because arbitrage opportunities are restricted and we have the greatest supply there. Hives price moves because it first moves on Upbit. But 99% of people can't access this market.

Regarding the second point, I am not sure myself if they made such a great deal of profit from it. But this post shows that this "scheme" definitely happened or happens. How else would you explain the decline of Hive and the sudden influx of HBD to that exchange?