As I mentioned, unless you are already rich in the first place, noone is going to throw hundreds of thousands of dollars at a project unless they think think they can make a profit from it.
Think about it this way. Would you be willing to quit your current job, and empty your bank account, and potentially take on debt in order to fund this project that you want to do? And with no expectations of making any money off of it? When there's a 70% chance that at the end of 2-3 years you will end up with little to no money, and possibly only debt. And at the same time limit yourself to only breaking even for that other 30%.
So at the end of say 2 years. There's a 30% chance you'll end up with the same amount of money as you started with. And a 70% chance that you'll end up with no money.
And yes, I've heard of stories of independant developers who have self funded their projects. Many of them taking 5-10 years to finish their game because they didn't want to take on debt. and thus had to keep working regular jobs while doing their projects on the side.
And as I mentioned before. For small budget indie games that's fine. But once you get into mid sized developement. That is no longer a luxury that is available.
Regards,
SB