I used to run a popular blog in 2000. The thing I didn't like about blogging, was that if I shut down my blog (which I eventually did), I would lose my entire

I used to run a popular blog in 2000. The thing I didn't like about blogging, was that if I shut down my blog (which I eventually did), I would lose my entire audience. So I started letting people sign up for email newsletters back then, just to kind of "own" the contact info of my readers, so I could continue communicating with them, even if I shut down my blog. Today everyone is a publisher. And with the proliferation of social media, RSS and eventually Twitter came to solve that problem -- even if I don't tweet for a year, I'll still have my followers (assuming people are still using Twitter then, which I think they will be). However, having the email addresses of your followers & fans still seems a bit more durable, not relying on Twitter or any other service. So... that's why I built it. Did I think I would sell it so quickly? Originally, no.