The first mistake you have made: You came to these forums.
Opinions of all these people are irrelevant. You know why? Because its all about your nationality... Some nations values more the work-power, some the ideas. Evidently, the nation you live in is preferring the ideas over work-power. Where are you from? I guess its some communistic or post-communistic nation.
The question is: Are there some good game developing companies in your country?
If yes: Keep trying. Your GDD have THE value.
If not: Its a waste of time. The America/Eastern Europe will not buy it. These nations lacks the work-power, but they are full of ideas ...
Complete utter B.S.
No one is going to buy a GDD from a nobody who hasn't shown the skills to successfuly lead a team of developers. Sorry, but that's just the way it works.
And 4000(!) pages of game design? Come on, that's just ridiculous. Usually the first design document iteration should be as concise and high level as possible. Game design is (should be) an iterative process, where you implement > test > identitfy problems > redesign > implement... until you have a polished product.
That might sound discouraging but please notice that every once in a while that kind of thread pops up here.
Why don't you reduce your gdd to its essence and try to build a team with which you implement that design. If you have a fun, working game you will have a muuuuch bigger chance to make any money from it.
cheers