jumping on the bandwagon of "casual gaming" is a tad too easy.
Casual game = little money spent = lots of money earned
Too bad that consoles like the wii are the perfect example on how that reasoning is inherently flawed.
The casual gaming market may be profitable for a few, but in the end it's also too easily saturated. A few best sellers (less than in the actual AAA gaming market), normally from the companies that spend a TON in marketing (there goes the little money spent factor) and a truckload of crap that doesn't sell for squat.
Casual gaming is simply the gaming flavor of the month, or fad of the month to be precise.