Everyone has their own reasons, I'm sure. Here are some that come to mind: - They don't have an idea for a startup - They've never thought about entrepreneurship - They don't know how to go about doing it - They might be afraid to try - They just don't feel like it; the commitment involved is not appealing to them - They have other interests in life that are more important to them - Their life situation prevents them from pursuing a startup idea

I don't quite agree that "web developers" don't have the qualities of "startup founders". Many probably do, but might not show them for whatever reason.

Chance plays a huge role is success, so the qualities of "successful" startup founders might not be that different from the "unsuccessful" ones.

Ambition, passion, persistence, motivation, good communication skills, a certain level of intelligence, ability to work with and motivate people are some qualities (certainly not all) that you'll probably find in founders.