You don't (or shouldn't) join an early stage startup with the expectation that you'll get rich by any measure from the equity. You join an early stage startup because you likely want to eventually found your own startup in which you'll own > 50% of it. That's your shot at getting rich. The experience as an early stage employee just exposes you to the chaos and ups and downs of it all, and if it goes well then yeah maybe you make some money, but even more worthwhile is the connections you make in the process (other employees plus potentially the VCs who invested and may ultimately invest in you down the line).

*edit: realized I didn't actually address the question of topic - I would expect the range to be between 0.25% and 0.75%