That's the question. What is your bargaining power? All you have is your ability to stop working. Which, indeed, can exert power –– But if you are poor how long can you really go without work before you starve to death?
The rich can afford to sit around and wait until the over side caves. But unless you working excessive hours is the only thing keeping a business afloat (in which case, what do you stand to gain?), most likely they can outlast poor you with ease. Once you give up, your power is gone.
If you can't go without work for weeks, months, maybe even years, the business will quickly recognize your idle threat is just that. It is not just coincidence that unions are rare in professions where there isn't a whole lot of money floating around.
> Well, I can tell you a very real scenario.
This doesn't appear to speak to bargaining power, just communication. No power was needed to be exerted. If it came to a point where power needed to be exerted, how long would your mother have actually lasted? Assuming she could have lasted long enough, perhaps she wasn't as poor as you let on?