Just want to point out something as I get the feeling you may not realize it, you realize that when it comes to the moderators and supervisors, it is not anyone's "job" correct? That all the staff except for the few that run the site are volunteers and get paid nothing at all. In fact most of them have regular full time jobs and do this on the side. So while I get the point you are trying to make, kinda sorta, this is really no ones job as you claim, so yeah, a little thanks is in order to be quite honest, as all of these people are volunteering their time in order to make it a better place for everyone else. And as pointed out, in most cases they already have some sort of "real world" job.
About the only people one can say get perks are the news staff, and even then, they have to review any "perks" they may get. And in fact most of the nicer stuff is only for review purposes and needs to get sent back.
Yes, I figured the majority of them do it for free. The word "job" has no implication to there being a strictly economic gain. As I stated before it wouldn't be done if there wasn't some benefit to them. No one works for free unless they're mentally ill, a martyr, or are being led on/scammed. Although, I could argue that if the reason were martyrdom than there could still be the benefit of becoming the martyr - which as I studied in psychology years ago - is actually something martyrs would strive for the opportunity to be (a martyr).