I suppose, in theory, some asshole like your god George Soros could do that, but then h'ed be wiping out his investment as well.
Ah, so it is susceptible to market manipulation. So what's the benefit? You can't use it anyway. You said yourself you have to convert it into currency that is accepted by retailers and banks. Why would anyone pour any money into what is so obviously a scam?
Again, I have a relatively meager holding in Bitcoin. But it's merely part of a large, diverse portfolio.
Don't believe you.