Early stage startups are really not worth it from a risk/rewards perspective.
The risk is "maybe didn't maximize earnings over n years". The reward, regardless of the startup's success is "learned a lot, enjoyed myself a lot". That's reward I get no matter what.
EDIT: Additionally, I applied in the fashion of #3 (from the article).
Also, if you are a VC or a co-founder, then the risk/rewards ratio totally changes, and it's most definitely worth it. But if you are like the rest of us, then it's a big NO.