In 2008, I worked in a truck stop off I-10 in New Mexico. Worker's Comp was deducted from my check every week.
My employer made me climb up on a chair to change a lightbulb. I told him I wouldn't, couldn't; he said if I did not, I was fired. So I climbed up on the chair, raised my hands up to the bulb -- and the chair collapsed. I didn't fall off the chair; the chair broke in half under me. I fell, and hit my head on the counter, really, really hard.
About 3 AM, I woke up, nauseated, seeing double, and a ferocious headache. To the ER.
Concussed. My friend called my boss, boss said, don't worry, we pay hospital bill. Six hours in the ER, $3500.
A few months later, I was sued for the $3500.
Turns out employer never paid the WC; he was putting all that money in his own pocket. I hired a lawyer, he hired a private investigator. My boss could not be found; he disappeared into some ethnic ("Christian" Armenian) enclave in southern California.
The fraud case against my employer let me off the hook for the hospital bill.
At least if I were paying my own WC insurance, I would be sure the funds were actually going to pay for WC!!!!