If you get 300 hops a day but no sales, it may be a problem with your landing page (if you have any, which can be a cause too), traffic and maybe some other small things... You have to tell us more about how you're promoting it
I see a lot of these ads on the google display network and a few on FB ads.
So it's definitely converting for them. I'd also like to add that they have a pretty good LP that focuses a lot on emotional triggers.