Author Chris Vermeulen (a gold guy, but, hey I am too) writes that China and big investors (the Winkelvoss twins have not gone away) represent the bulk of new BTC purchases.
http://www.24hgold.com/english/news-gold-silver-large-investors-become-major-buyers-of-bitcoin.aspx?article=8762349738H11690&redirect=false&contributor=Chris+Vermeulen
The twins maybe a real gamblers to gamble and put to risk million or I should I say their billions of investment. If in case the price will go down they will get a heart attack
But I guess they have a group of financial analysts and trading experts to monitor and predict the movement of bitcoins. I'm sure they are not stupid to waste such big money that they are not sure they will profit.