I actually wrote a reply to this a few days ago, only to find out the IE ate it. GRRRR at school computers.
I'm of a like mind with a few here it seems, but I think that, similar to Fireangel, that part of the reason that DT is still around, and so good, is the sheer fact that they have jobs on the side. I think that it's what keeps them sane, to have lives outside of their music, and I think that it guarantees that each album the release will truly carry on their great tradition. I think, not that I have much experience in the area, that it's one of those things where no matter how much you like a job, after a while you begin treating it like a job rather than as something fun.
I guess that the fact that the DT members have other jobs ensures that any time they come back together to record, it's because they all really want to, and not because they need the cash, or something like that.
Fireangel actually raised a good point there at the end - I wonder how difficult it is to maintain a steady job on the side with interruptions for things like tours and such. Anyway, back to class.
~kov.