It's like gambling where you can increase your chances with good informations, but the manipulation from the P&D groups can make it very difficult.
You can expect any manipulation especially when you are trading with a low volume coins, that should be part of the factors that you should consider as a trader for you to be able to do your job well and to be a successful trader.
just trading for example at yobit is more gambling , a lot of dead coins are there,
and sometimes gambling and traiding is same