So I think what you are saying is that Bitcoin doesn't have any inherent value in it. This I believe (to the best of my knowledge, someone correct me if I am wrong. I am also still learning) is true. Bitcoin price is simply determined by supply and demand. And like gold or silver or copper, exchanges have put a price to the scarcity of Bitcoin and the demand for it which is what determines price.
Supply and demand are concepts that refer to resources traded in the market. Bitcoin is not a resource. It's a number that you get when giving your resources to someone in order to join Nakamoto scheme. So, bitcoin has nothing to do with supply and demand. The same is true for the concept of scarcity. Only resources can be scarce. Numbers are infinite.