Mind you, I've always bought equipment that's just a step below the top-of-the-line. It's a trick I learned from my friend Bart (who I worked for for a while) to get the most bang for my buck.
So when P4 machines came out, I got a P3/800. Bought macs with just below the top processor speed available. Bought a Centrino Pentium M 1.6ghz with 802.11b networking when the 1.7's and a/b/g combo cards were coming out.
At this point, I want an iMac 20" because it's got almost all the power of a PowerMac G5 and a nice big (but not the biggest) display, and is a hell of a lot cheaper. I got a 40gb iPod. I've got the year-old Centrino laptop. They should have years of life before new technology outstrips them so badly that they're unusable.
I couldn't care less about the Mac Mini, or the iPod Shuffle. Neither of them anything near a power performance leader.
But, you know, Apple has spent years building equipment that I wanted, and only equipment that I wanted. If everything they're building is what I want, they're missing out on folks who aren't me, and I can buy only so much equipment.