I still don't see how it matters if a smaller group of people were willing to spend a larger amount of money.
Although, I do sense car analogy potential!
It doesn't. If Toyota sold 1 million Camrys at $25,000 and Mercedes sold 250K CL600 for $100K then the revenue would be the same, which is all good.
But the primary generator of revenue and profit aren't hardware sales they are software sales so the number of units sold are far more important then the revenue generated by the sales of the consoles themselves. The revenue of hardware sales is important in that it alleviates the total subsidization of hardware costs through software sales.
If the Camrys (360) and CL600s (PS3) ran on fuel (games) only sold through their manufacturers and fuel cost per liter or gallon (MRSP) was the same then Toyota would have a major advantage with 4X as many Camrys on the road unless the CL600 were 4X more fuel hungry (attachment rate).
With the 360 you have an 8 million more units whose owners consumes ~3 more games on average than your typical PS3 owner.
Yes, the revenue from hardware sales is roughly the same between the 360 and PS3 but the 360's attachment rate and total consoles advantage allows MS to generate twice the amount of revenue from full retail games sales then Sony.
The more units you have the better, so when you see that you and your competitors have generated 8-11 billion in revenue from hardware sales but your competitors have generated between 8-27 million additional revenue streams you can hardly look at in a positive light especially considering the fact that your revenue streams on average produce no better or worse than your competitors.