> This is in part because the risk was not shared equally.
Developer joining a startup risks almost as much as a founder. He leaves his existing job for a promise of a salary, and if this startup fails - is left without a job, and possibly, without a salary either. This happened to me, and I was paid for first 2 months out of 6 I worked there.
> The investors and others who put in money or time and energy for little or not pay
Investors still have most of their money, I am left without a job, unable to pay my mortgage and possibly buy food.
Imagine this: I put $X, you put $Y into an investment. If investment is successful, I get a 100$, you get $Y+$X-$100. If it is not, we both get nothing. Would you consider this investment fair? No sane person would put a money into an investment fund, expecting a fixed value in return, but employer-employee relations are exactly that.