My advice to people who want to work in a startup is always very simple: Ignore any equity. If you'd take the job without any equity then take the job. If the equity is part of your reason for taking the job, you probably shouldn't take it. Base rate neglect[1] means we are terrible at evaluating the probability of equity being valuable. For every story about someone making millions out of their equity when the start…
I think that this also applies the other way around. If you're a founder building your early team, you should not hire people who want to join because of the equity. You should be bringing in people because they want to work on the problem for the salary that you can give them or promise to give.
If you hire someone who has an expectation that he will make a million dollars in 4 years - it can lead to a lot of bitterness while you are building the product - especially when you are having a few bad months. Have seen this happening a bunch of times.
Equity != Money, equity ~= the percentage of ownership and responsibility.
Edit: Salary AND relatively high ownership of the company / product. Some people don't mind taking risks if they have an opportunity to build and own something great.