I dunno, I'm fascinated by this stuff too, not just because I'm in a band and would like to see the inner workings firsthand, but just because as a fan, I'd love to see "where the money goes." Oh, yeah, and plus I'm a nerd.
I know that at Anthrax's level, there's always trickles of $ coming in, from radio airplay (believe it or not) worldwide, music used as background for TV shows, licensing for compilations (all that "publishing" money that no one seems to fully understand or grasp), plus of course catalog sales. But those just aren't the big deal they used to be -- for one thing, the "CD era" has existed long enough, that there aren't still thousands of people replacing their cassettes and LP's. For another, many people will download the songs they want - a casual 30-something metalhead might just want "I Am the Law" or "Caught In a Mosh," and he's not gonna drive all over town or spend $10 at CDNow ordering the whole CD.
So how much does Scott Ian actually get in a pay envelope from Island Records for the couple thousand old CDs they probably move in a year? I have no idea.
It can't be all THAT much... then again, Anthrax have released only two albums (counting WCFYA) in the last 7-8 years, with not all that much touring, and we haven't seen him down at the Sizzler bussing tables just yet. So maybe it's more than we think?
Going back to the Clutch comparison - I think being a band in their position would lead to MORE catalog sales than Anthrax, actually. There aren't piles of their used CDs around (one of the reasons I think the recent reissues sold so poorly - hard to rationalize paying $16 for an album that's always in the $2 bin used, bonus tracks or no), and their releases are periodic enough that there's always a small, steady influx of new fans, who discover the newest album, then go back and get the old ones.
I hope this happens for Anthrax when WCFYA makes it out in the US - imagine if "Safe Home" took off, and a whole new generation of kids went back and checked out "Persistence of Time" and "Among the Living" (and maybe finally gave the Bush-era catalog its due, too)!
Finally, one of the times I talked to Scott, I asked him about money (I couldn't resist asking if they'd really gotten a million to leave Elektra - he said they didn't). His answer (not a direct quote) was "I've been rich, and then broke, and then rich, and then broke, a few times in my life, and i doesn't really affect me one way or the other. If I've got it, I spend it." Pretty healthy attitude to take, if ya ask me (of course, I've only ever been on one side of that rich/broke see-saw, so what the hell do I know?).....
Keith