All the stress, risk and sleepless nights which come with running a startup, isn't worth the (potential) 10-10000x pay-off for me, when I already enjoy enough freedoms (autonomy + income + free time) to do what I love outside of my career. So I greatly prefer to piggy back a startups salary and compensation package instead, and hop to the next one a few years later. Having seen the inside of quite a few, I don't feel like I am missing out on starting one myself.
