Mozilla has boatloads of money, but they don't seem keen on increasing investing in FF- if anything, cutting servo seemed quite the opposite.
To me, Mozilla is like the Wikimedia foundation- they take in a lot of money, but it seems like very little actually goes to the projects people think of when they hear the name.
Maybe that isn't a bad thing- surely there are worthy projects they could be investing in, in addition to FF or Wikipedia - but supporting them isn't as simple as offering more bodies in seats, because lack of money and talent isn't what is holding them back.