Ah, people who disagree are uneducated on it. Nice! I actually understand the technology, but my view is as follows:
* As an investment I take the Warren Buffet approach - I will only invest in things where I can see fundamentals. Bitcoin has no fundamentals. There is no utility and it generates no income, therefore it is purely speculative. If people want to invest in pure speculation then go ahead.
* As a currency: I can't spend any of them anywhere I want to spend money without an intermediary, so it's a poor currency.
My main view on how Bitcoin (as an example) has sustained financial growth is: The price rises, people invest money because they see growth, this drives a higher price, people invest more money because they see growth, this pushes the price up, and so on and so on. The problem is that these sort of structures don't last for ever, and they are reliant on attracting new people at the 'bottom' to push more revenue into the ecosystem so that people who joined earlier can get more money. People who are 'in' are incentivised to promote it and get more people to join, because it pushes the price up further and new money is constantly needed to keep the growth going. Does this money making structure remind anyone of anything else?