Erm... bit of hyperbole, that? Maybe a VERY few products had that kind of revenue & profit; but I believe(1) that, in general, they simply sold "better than average."
- Steve, the g33k
(1): Having corresponded with a couple of game-publishers (who I have NOT asked permission to give a "reveal" on their info, so I won't state publicly ... but they produced campain/setting books, adventures, monster-books, etc), I've been told that their d20 lines tended to do well, but not fantatstically.