This analogy isnt complete though because it doesnt take into account network health. Its easy to make a cryptocurrency, but hard to build a network large enough to defend against various attacks. There are many, man coins out there suseptible to double spending - bitcoin is the most secure, and this security adds some value in itself.
Maybe you're jumping to the conclusion too fast. Most coins don't have publicly declared vulnerabilities (ie there might be many 0days). But it might be untrue that bitcoin price is not being manipulated (an attack itself on the network) based on multiple articles on HN alone.
