For starters, any service trying to push food items needs pictures. Lots of pictures, huge ones. You only have one pic of chocolate, and if you don't like bacon covering the chocolate, you're turned off.
Secondly, since you are trying to get paid signups immediately, you can work a bit harder to establish trust. Add a few more pages. About us, FAQ, contact us, past months' offerings. Fill in the web design so it doesn't look like so stark. Show me you're a reputable merchant, that values security and privacy, and that I can reach if my chocolate doesn't show up.
If you find it hard to get paid signups right away, consider an alternate call to action. Maybe people can sign up for your newsletter with chocolate-related recipes every month. Maybe they can get email reminders when you offer a new month's flavor.
If you are looking for additional inspiration, go to the Kickstarter food section. There are lots of little bakeries and home kitchens there that have had viral campaigns for cookies, brownies, etc. See what worked for the biggest successes there.