The first time around, it was the day I opened the site, since the site was a store and I knew exactly where to get good free advertising for what I was selling

The first time around, it was the day I opened the site, since the site was a store and I knew exactly where to get good free advertising for what I was selling. These days, the apps I build are a lot more complex and targeted to very specific business use cases... and I'm lucky to get a couple signups in a month, despite nonstop Google/Bing PPC advertising.