And a good engineer usually does not make a good salesperson. Starting a company does not make a good engineer better nor does it guarantee a better path in one's career. On the contrary I would dare say.
For example, in the company I work for, sometimes I slip into the mode of feeling like I "own" the product we're making, making an extra effort, being emotionally invested, etc. But then I remember, I would just be a fool who works for his employer for free. Also, achieving change requires a lot more effort and often fails, which can be demotivating. In general, I feel like I could run things substantially better if I had the power. Seeing the mediocrity at fairly successful companies makes me really think about working at a startup.
This hits close to home.