Coin with No trading volume has many reasons:
+ The core changes need to limit transactions to ensure safety
+ Coin is no longer interested in the community.
+ Some other causes (but the possibility is high for altcoins who are about to die or are not interested in developing)
..and may I add:
+ No use case and movement is purely on hype. Once the popularity is waning, so is trading and finally dies.
+ Development has no direction. After a hype, developers looks for another project to profit. People behind not interested anymore. (this happens to most project, definitely a scam)