The stats are pretty interesting if you didn't know them
Actually they're not really that interesting, because casual gamers is a useless label for several different market segments. In the imortal words of Geoffrey A. Moore.
Of course, talking this way about marketing merely throws the burden of definition onto market, which we will define, for the purpose of high-tech, as
* a set of actual or potential customers
* for a given set of products or services
* who have a common set of needs or wants, and
* who reference each other when making a buying descision.
People intuitively understand every part of this definition, except the last.
Also the notion that the majority of popcap sales go to casual gamers is absurd. Until they where linked on (and later advertised on) Penny Arcade, a hard core gamer site by anyones definition, nobody had even heard of popcap games.