If Snow Leopard was a significant upgrade and much different from Leopard itself, your argument would hold a lot more water. But it's not.
It's optimization and bug and interface fixes, much of which could or should be offered at some price for PowerPC users. Obviously this is my opinion and 75% of Mac users disagree with me since most are INTEL Mac owners.
The other thing that bugs me is that we all know Apple has internal PPC builds of Snow Leopard, not to mention probably builds for ARM chips as well in development. Otherwise, there would never have been a surprise INTEL Mac in the first place running Mac OS X.
Dude, relax.
Like others have said, investing $10,000 into a range of computer at once is probably a silly idea; it's always better to stagger new computers, that way, you'll be able to phase out older ones, replacing them with less money upfront.
Look at my sig, all PPC Macs aside from my MBP. Am I whining that SL isn't going to run on all of them? Hardly. It's best to use the OS that's most optimized for a specific machine. Tiger (10.4.11) is a stable and powerful OS, and one that I still find useful on a daily basic.
It will be nice to have SL on my primary unit, but chances are, you're not going to need the most up-to-date system on every computer you own.