There are two main reasons why everyone will say “no” to a new idea or a new method of doing things.
The first reason is obvious… your idea is simply not viable or good enough. The second reason is because it is not safe. It’s not safe because no one has seen anything like it and therefore they can’t measure it.
How do you tell the difference? After-all there is nothing worse than flogging a dead horse and trying to get a project off the ground that will never fly.
Most truly great films were difficult to fund, most innovations were laughed at by skeptics; the fact that you are being constantly rejected probably means you are onto something.