[annoyingnoob]

1. Its hard. 2. No one will pay for a browser.

[fludlight]

The existence of open source software suggests there are other factors.

[annoyingnoob]

Such as?

[fctorial]

I think the OP wanted to say that there are large, complex, high quality community driven software projects.

[annoyingnoob]

My take-away from the post here is that to build a good browser you'll need to include some licensed bits. You might have a hard time incorporating those licensed bits into an open source project. Which sort of brings things back around to a business problem.