It makes sense that some of the lowest priced coins are the highest volume sellers. This and the fact that some consumers see the X for X as a no lose investment. The thought being that one can at least get their investment back if they so choose to sell, versus some of the NCLT that is dropping in value post release.
What surprises me is the staying power of;
#18 Celebrating Canada - I like this coin.
But I do agree Commems that there is a theme among the top sellers, X for X dominates.