Regarding bankers/financial pirates not taking over Bitcoin, With a market cap of around $6 Billion, Bitcoin is still very much a penny stock in the grander scheme of things. Any establishment financial house could grab as much of it as they wanted at any price that they wanted. If they were to take an interest in it however, the most likely price that they took the lino share of their stake in Bitcoin would be at a very very low price and they have both the expertise and the funds to ensure that the market was depressed low enough as to be to their liking. This sort of thing goes on in the finance world all the time. I find it amusing that you somehow think that Bitcoin is immune.
It is not immune, this is something we see now afterall, but you can not buy large quantities no matter how hard you try. There's only so much gullible people you can take coins from, and they tend to not have much. 10, 20 thousand total? Possible, but anything resembling a controlling market share would be hard and would cause a rally to new highs. See, no large holder would sell you coins at this prices where we sit now, no matter how much you scare them
So your only option is taking it from some monkey like Karpeles.