I thought I would never sell my company. I started it as a hobby in 1997. When NPR did a story about me in 2004, I said I’d stick it out until the end, and I meant it.
In 2007 I did a ground-up rewrite of the the website from scratch. And man, it was beautiful code. My proudest achievement of my life so far is that backend software. Wonderfully organized, extensible, and efficient: the culmination of everything I’d learned about programming in 10 years.