The high risk, yield huge short term results. They obviously just playing the market with BTC and pushing the returns.
They might have seen, something, we have missed, and plan to invest long term, but I think, they evaluated the trend over the whole period, and saw a steady increase in it's value. {And they buying low and selling high, in small chunks}
Interresting article though, and a indication that some people is seeing it's store value. {I always advice people to look at BTC over a 5 year period, for investment purpose.}
With how young bitcoin is, I think people looking to invest in bitcoin should see a nice return even within a 2 year timeframe. With the current adoption rate, 5 years from now I can only imagine how huge bitcoin will be. 1-2 years ago people may have said "bitcoin will be huge or nothing at all in 2 years", but we have come a LONG way since then.