Expensive?
But Mozilla started as a not for profit, made a browser engine, and the Servo that they mentioned has enough money, and other, smaller projects like Dillo and Palemoon continues on.. as was mentioned, Opera did it for some years, and Microsoft as well.
Perhaps only because they're trying to optimize certain things to excess, make it cater to unnecessary business demands, and not make something that just renders HTML (and CSS). Potentially even using node.js or similar for javascript -- a project that already exists. (Yes, yes, Node comes from Chrome's browser engine, and . . .)
Perhaps the competition of *more* _smaller_ browsers will be better overall for the open web, if not better for singular corporate interests. (Or for-profit paychecks from non-profits, for that matter.)
Perhaps it's the market dominance and anti-trust that lead to other browsers, such as Opera and IE, not working out in the end.
Admitted, it *seems* more painful to rip the leech off - but likely (foresight is hard..) things will be overall better in time to come. Like a prisoner being released, and not having a system to manage their life any more - how do they even start to manage their own, now?