Bit coins are really an all or nothing zero sum bet. Either they will eventually play a very significant role in the economy, or they will be worthless. Long term there really is no in between.
For this reason it's well worth a million or more to at least by one coin. It's a hedge against what may happen in the future. There are millions of millionaires in the world and only will there ever be 21 million bit coins ever mined. If you buy even one now it seriously could be worth a million within 10 years based on current adoption. How many getbiggers will have one in ten years and how many will be reading this and be thinking "damn, if only I had bought when I had the chance?"
To me is very very obvious that we will see huge amounts of money from Japan, Korea, China, Russia and many other countries being invested over the coming years.