I think Apple's classification of Consumer and Pro are obsolete.
A "consumer" cares about value, features, and longevity. The iMac line is expensive, has CPUs that are long-in-the-tooth, two-generations-old video, and a lack of longevity at this point (G4s are on the way out). The iMacs have pitiful game performance, so-so-video and audio performance, and are expensive.
A "pro" cares about performance, reliability, and longevity. Well, the Power Mac G5s seem to deliver on that pretty well. Pros aren't running games on their computers, they're running graphics, design, video editing, audio/music... they're probably not playing games and doing iLife. Maybe they're schools, businesses, etc. that need to run the machine for 3-4 years before replacing it or getting a new lease.
There's a whole legion of computer purchasers who lie between Apple's Consumer and Pro lines. People like me. We want to run games at respectable frame rates. We want to run Final Cut Express, Logic Audio, etc. Maybe we want to add another hard drive, or upgrade a component or two during the lifecycle of the machine. Apple has completely neglected us, instead catering to its skewed ideas of consumer vs. pro. I have to buy Pro to get the features I want, yet I consider myself a consumer.
Apple obviously likes to work in 3s.. the Papa Bear/Mama Bear/Baby Bear scenarios. Well, the eMac and iMac should be at the bottom, and the Power Mac at the top. In the middle should be a G5 machine with an upgradeable video card and room for a second hard drive.