Much is made of the incredibly thin trading on the US side....okay, maybe not "much" but it is discussed.
One thing though....look at the depth at the lowest bids and highest asks. As I write this on the CDN side its 1 lot bid at $1.96 and 5 lots on the ask for $2....
While RVXCF shows $1.50 - $1.53 with 400 lots on the bid and 900 on the ask.