Bitcoin is certainly valuable but Bitcoin can never be negative because it isn't a stable currency the worth is low and high but if the worth goes up we will easily make a profit cryptocurrency is additionally referred to as digital currency alternative currency or virtual currency.
Correction: No currency would ever be negative - They can only equal to 0. The prices of oli was negative because they cannot find a place to store them.
Correction 2: A value of something is determined by the equilibrium.
Correction 3: Don't have the mindset of Bitcoin is a "get-rich-quick" thing. It is not. The value behind it is from the miners and the technology behind it.
PS: IF Bitcoin [or any other cryptocurrency] were to be in negative in value, simply, you just need to burn your private keys/seed (or send it to a burn address). (note: Most exchanges DO NOT Support trades in NEGATIVE terms so I suppose that this would be very unlikely to happen).