Is it because webbrosers bring money while file managers don't?
Is it because current file managers are just great and do the work?
Why practically none of the alternate file managers for various platforms haven't become mainstream.
Think about IE4 and WindowsExplore back in '95, they were practically the same thing
Now, we have new serious contenders ( such as Firefox and Chrome ) that are pulling IE8 in the shape it has. While the WindowsExplorer is pretty much the same old thing.
Something I really really hate from most file manager is that I have to "click" too much to get into a folder which is too deep in the file system.
Of course I could be more organized, but, why is it faster for me to go to superuser.com than to c:\Users\oreyes\some\folder\with\some\other\path\superuser.txt?
( in Google Chrome I just type F6 + S + u + Enter )
Something is wrong here. I could create shortcuts, but again, it doesn't scale. I think file managers could do a better job.