1] Scratch my creative urge in public
2] Give substance to thought
3] Codify and automate processes liberating myself and others from drudgery
4] Build something that expands my luck surface
5] Communicate my ideas
6] Establish a brand presence
7] Participate as a creator and builder in the most revolutionary technical/organizational advance of my lifetime
8] Create value for people
9] Multiplier impact on my other skills
10] Potential business upside
Some of these are certainly true for programming more generally as well - some are specific to web development
