It's always "small" amounts like 50-500$, i.e. amounts that it sucks throwing out the window but that aren't big enough to justify sinking even more time in chasing.
I also don't believe this can be the only way. Most people don't have legal insurance and wouldn't pay a lawyer the equivalent of 1000$ for a dispute like that.
I'm talking every day stuff: a cellphone bill with an error on it (in the company's favour, always), or an Ikea piece of furniture that was delivered broken (but the package looked fine), or a voucher you were promised if you signed up for a particular health insurance plan and when it's time to get the voucher you're not eligible anymore... That kind of stuff.