Actually yes, well actually approaching zero, and I realize it doesn't sound right. The cognitive dissonance comes from the economics of information, they work differently than the economics of goods.
Imagine this thought experiment. Imagine there was a 100% fool proof copy protection scheme in China, and the only way to acquire Microsoft Office would be to buy it. Try to imagine how many people, who make $1000 in a year would then cough up the $495 to buy it?
Its not hard to imagine because there is no manufactured good in China that commands a 'half annual salary' value proposition that is not critical to a person's survival. And Microsoft Office isn't that item.
There is an exemplar that there is a $6M value for Word based on the $2 CDs that sell, so its not 'valueless.' And there are benefits to owning a legitimate copy over a pirated copy. Further, the cost of producing a pirated product (box, CD, getting started guide, etc) is less than $2 so there actually a real-goods sort of economic value analysis possible as well.
So all we really know is that the number is >= $2 and significantly less expensive than it was for the US and European markets [1]. That increased the value they extracted for office out of those markets tremendously. It was more than 10x that $1.50 price at $29/CD. And they captured a lot of value for it, millions and millions of dollars. But not billions of dollars.
Many have argued that much of NetFlix's streaming revenue has come from previous BitTorrent users [2]. Prior to NetFlix you could say BitTorrent was a "$xB" problem where $x is the money that has been re-captured by offering an alternative with an acceptable price.
But to understand how that works you have to think about what gives information value, its much more market driven that fiat driven. Sony can say "Its worth $X to own this movie" but if nobody buys it and it is heavily pirated they guessed wrong. Since the replication cost is nearly $0 they really are guessing at consumer value. Lots of DVDs sell for $9.99 or $4.99. At that price I won't even bother looking for a torrent, I'll just get the DVD. Its a market, it has different mechanisms that drive it.
[1] http://www.reuters.com/article/2008/09/23/microsoft-china-di...
[2] http://gigaom.com/2011/05/17/netflix-p2p-traffic/