This is called arbitage. You can also follow this through cryptopia dashboard. But if somethings is too good to be true than there probably an exchange's wallet is not working as there a lot of bots monitoring this arbitage oppurtunities.
This is indeed an arbitrage trading which you would simply bought coins on other exchange on cheaper prices and then sell it on other exchange with have higher selling price which you can normally gain profits on doing such thing.It is also a profitable way on making money but seeing on the exchange involve on doing arbitrage i would really say a big "NO" on using yobit.
