This has happened a few times. A CFA volunteer lit a fire so that he will be called on to fight it. They get paid for it. Its for the money
Speaking as a Victorian CFA volunteer, we don’t get paid for fighting fires. Arson by volunteers is, unfortunately, not all that uncommon. It tends to come from people who either get a thrill out of fire, or like the comradeship of firefighting.
A lot of the time our regular employers value our volunteering enough to pay us for the time we are at fires, instead of at work - but in essence, we are unpaid.
This is what we occasionally get as some sort of formal recognition. For the most part, we do what we do because it has to be done and we do it for each other.
Not usually.
People set fires because they get a sexual charge out of doing so. It's a pretty thoroughly documented pathology.
Some of these nuts also join volunteer fire depattments or even become professional fire fighters. It's because they're fascinated and obsessed with fire in general and like being around it.
The same thing can be seen by the apparent fact that people who are sexually attracted to children disproportionately enter professional fields where they are around children all the time.