Ask HN: When did people start paying for your SaaS and why?

When did people start paying for your SaaS? How many times did it take before you got it right? I don't suspect most people get it right on their first go, so what have you taken from your failures and what have been the biggest factors in your success in terms of gaining traction with your SaaS? In particular, what marketing/promo tactics have served you best?