They don't have to cough up $5 million to support Flash. That's a priniciple I can understand.
The salaries of all the cheerleaders and wheel-reinventors have to add up to something substantial. They've got piles of Google cash — they stopped begging for donations after their $60m search-referral windfall in 2006 got publicized, but they've gotten secretive about their financials after that.
I had found the 1099s a while back, but they stopped showing the whole picture after the Mozilla Corporation was created to take the revenue.