You had 12199 downloads in one day or one week? Even in a week, it's a lot (I don't even get half of it). You should get a lot more sales, but I don't know what you share. If you share things that people can easily find on other filehosts, it might explain your stats (+ the competition if you share on forums).
Sorry I'm the only poster on my site.
All I can tell you is that if you build a collection of original content on your own website, you'll get daily sales. I'm far to be the best poster but I know this stategy works.