Ask HN: Getting users to check app without signing up, good or bad UX?

I created a small blogging engine at http://substancehq.com/ , One thing I did, which I think is clever, is allowing users to create a blog without signing up. I submitted it to HN and reddit and people created 30 sites on it. I am happy with that number, however, 95% people did not finish the next step of entering their email and finishing the signup. Is it a good idea to keep it this way? I definitely want to be able to contact the users for their feedback but without an email I cannot do that. Any suggestions on improving this?