It actually takes a lot of people to build and maintain a modern competitive browser. Not paying those people and instead investing the revenue would end the project in short order. Mozilla is already outgunned on staff by the other major browser makers and you want us to cut staff to save more? That's not realistic, IMO.
I don't disagree with you, but Mozilla takes in hundreds of millions of dollars a year and I don't think they spend all of that on Firefox - possibly not even the majority of it!
I think that if they cut back on some of the other projects in the short-term, they could ensure the foundation was funded for the long-term - to support Firefox and anything else they deem valuable.
