I haven’t checked my stats recently, but a month ago I found the same thing. I think I may have had 25 downloads and no purchases, which I thought was really odd. I have fairly new poker players on my site, so I thought it was possible, but I will check when I get home tonight, As well every poker player I know has purchased it, so I’m not sure what is up with the stats.
BTW what else do you promote through them? I haven’t looked to see what else is offered.