It's almost always worth the lawsuit, it's cheaper for a company to pay an employee off than fight them in court.

The actual numbers of people who take abusive companies to court is low, just look up the statistics of companies who constructively dismiss women after pregnancies, compared to the number who actually get sued.

It's a thing to do carefully; especially in a small industry. Unless the situation is pretty messed up it's generally better to take a small hit than become known as someone who litigates against their employer.

On the other hand, full respect to anyone who stands up for themselves when the situation warrants it.