I often get coins that have large volumes but are very difficult to sell. all are controlled by bots buy and sell orders are filled with bots that manipulate the volume.
The coins are only listed in one exchange, so there is no other choice to sell coins like that, except selling on buy orders and will be executed by the bot.
If the coin is manipulated or using bots in certain market that can't be considered a high volumes coin though. only the genuine ones could be considered as one of that. I honestly pissed off with the existence of that bots aswell. It's like they are trying to give us false information and make us screwed.
Especially on todays exchanges. The numbers are just terrible, almost every single exchange is doing wash trading and the number of real trades is scary low. Furthermore, without further development a token is worth nothing.
Only unreliable exchange I assume, the popular ones rarely does this but doesn't guarantee that they are not doing this anytime soon. only time will let us know.