Well you can't blame them for giving you negative points because of having different opinions. You cannot avoid that kind of thing here in the forum. Everyone here in the forum are free to give their own opinions and we are free to give whatever ratings we want to give.
simply avoid new trades buddy , and search for what the individuals are stating about the trade you need to work in , and in the event that you need to ensure send 10 dollars to the trade and afterward attempt to withdrawl it just to test it
no, yobit exchange is not scamming all of us. A cryptocurrecy's value depends on buyer and sellers that in market. coinbase and yobit is different exchanges and they are not connected that means they have their own matket and own buyers and sellers. This buyers and sellers can bid different prices in same cryptocurrecy and that caused price difference between exchanges.