From the Vertcoin Discord

 According to coinmarketcap, this exchange is reliable...... Mmm..... Strange.

No clear communication for service & being very slow with paying back assets comes on top of the issues with the wash-trade. Plus get spam after giving them your e-mail adress. They even make the exchange for "take the money and run" not that easy at all.

Exchanges like this come across as being run by one or some people only. If this is the case, then this does not have to be problem, but in this case it clearly is a problem. If an exchange even isn't useable as a "take the money and run" exchange, then I'd say its best to not use it at all.