It's a hobby - no one is paying vast amounts of money to beef up legacy systems, or for pricey NG OS4 PPC boards, or for expensive OS licenses for old Mac PPC hardware for any reason other than the love of the platform.
It's about fun, start taking it too seriously you realize it's just a big race towards obsolescence. We buy and use what we use cause it's fun, and in a world where 3ghz commodity PC's can be had for $400 at a Best Buy, you gotta pay to play if you want to be different.
Pick your poison and enjoy it I figure.
Benchmarks on these systems mean absolutely nothing because no one in their right minds would use these systems for intensive tasks like rendering or encoding when you have a far faster PC available. I'm not going to run Blender on MOS or OS4 hardware for production stuff just because I can, I'll bring out the big guns. Benchmarks on the Amiga platform is a pecker measuring contest and nothing more