A $500 Million Week for Grand Theft Auto
nytimes.com
nytimes.com
And somehow this company is only worth $2B?
Additionally, GTA sales aren't recurring each year and although the GTA effect will certainly help them this year there's a lot of time between GTA releases to account for. I'd say $2 billion is pretty reasonable for a company that lost $138 million in FY07.
Basically, there seems to be very little confidence that most game companies will ever be sustainably profitable. It's the hit-drivenness and therefore riskiness of the business that's discouraging everyone from investing. There is a slow trend towards smaller development budgets, but it's certainly not coming from within the existing players, profitable or not. (let's face it, having ~70 people work on one project for 2½ years is pretty insane if you have no idea whether anyone will even like it)