in other hand , coin's price are dumping lower and lower
It's obvious that they're buying off exchange. Buying/selling on an exchange is pretty stupid anyway because it leaves permanent traces tied to your identity.
It's obvious? How exactly Hyena? I know that you are into Bitcoin to the level of a religiously devoted man, but some proof now and then would be nice.
To me personally, proof is my own actions I prefer to do business off exchange when I need actual fiat toilet paper. Also, it's pretty obvious that a millionaire buying in wouldn't want to do it on exchange due to the slippage. If that isn't obvious to you then there's not much for us to discuss.