Volunteers are the norm, full-time salary are the exception, and that is the far exception when you add up the number of volunteer departments vs full-time career departments in the country.
The volunteers really are that...non-compensated. I know guys on two departments because they care, and there aren't enough firefighters to go around. They care that those are their neighbors who's houses burn, get into accidents, and have life threatening health issues. And for their service they are lucky to get $100 at the end of the year which doesn't come close to returning what they've given out of their pocket in their own time, fuel, materials, etc.
I was recently at a volunteer fire station in northwest Ohio where the Chief made some comments that really stuck with me. He said he'd love to get some new equipment that works and helps them to get things done, but he couldn't submit a working budget because there was no city council...nobody ran. And when that happens, who puts fuel in the trucks? Who buys the tools and equipment? Who heats the fire station? Who pays the insurance, which can cost a single, small volunteer department $250k per year?
And what happens when the local volunteer station closes because it wasn't funded? The risk, response time, and insurance all increases for you and all of your neighbors who are now serviced by a department farther away, which is now taking more calls and is spread even thinner.
Fighting fires has become a rare activity. The largest amount of calls taken are, by far, medical. Stubbed toes to highway accidents, these are the guys who will get out of bed at 2am, rush to the scene of an accident, and attempt to save your friends and/or family after a drunk driver has plowed into them at an intersection, or go running out into a field after that plane goes down. And they don't do it for the money, because there is none.
Career firefighters with good pay do exist, but it's rare in the US for a municipal department. On the industrial side with their private industrial departments it's standard. The guys at Saudi Aramco are well compensated, but more than half of that is just for having to live out there as an expat. At home in the US it would be the guys at the refineries who make the $.
I don't think there is anything wrong with the OP for his original post or his opinion, but I saw a few piling on here with some misconceptions about what it is these guys do and what they receive. I'd say you can pick on the industrial guys if you want, but it's probably best to leave the volunteer municipal guys out of it.