If legit this will be great for the coin. 
My hunch as well is Yobit is a failing exchange. It's entire customer base sit there day after day only buying coins they believe are being pumped right there and then in front of their eyes.
Rarely do I ever see purchasing for longterm or simply purchasing coins on a hunch the price will rise. Its all about the fake volume coins manipulated by Yobit themselves. And with the price of Bitcoin
so high people don't want to take the risk so much on a coin. Its a terrible exchange for learning anything about trading as well.