It looks like it happens quite a bit. It sucks to see but a pump in price doesn't sound too bad.
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It sucks because Upbit is a closed exchange and because there is an enormous amount of liquid HIVE there, but otherwise I suppose if they happen, we might as well take advantage when we can, and not only look at them how they make profits using our coins. And more importantly, it's better not to feed the pump, because then they use fewer funds and make more profits, and those who buy during the pumps will likely be disappointed because there are slight chances they buy at the beginning of the pumps.