Ask HN: Can only silicon valley produce amazing and successful products?

I have been working on one web application idea since last few months. I have been discussing this with many people and got very good review. But many investors with whom I am in touch with they say you can not develop this product any where else except valley because resources and ecosystem required does not exist at my place. Now I don't actually believe completely in what they say, but I have been looking for some good developers but could not find one so had to do on my own. So as I see is that the quality of UI UX and code is actually compromised. Is it really not possible to get it developed anywhere else then valley? If I have financial constrains how do I make my way to valley?