Why PPC? I got completely and totally fed up with PCs by 2004, and switched to Linux. Unfortunately, I had to keep a PC around to allow me to continue using Photoshop. By early 2006 my mixed Linux/PC environment was making me crazy and the last generation G5s were out. I got a 2.3 GHz Dual Core with Tiger and fell in love with Apple all over again (had used them at work up until 1997, when my company decided that Windows 95 was "good enough" and took all our Macs away and replaced them with PCs).
There was something "magic" about that G5 - the quality, the smoothness of the GUI, all the functionality... it was amazing. In 2008 I upgraded to the highest end (8 Core, 3.2 GHz) Mac Pro and Leopard, and subsequently Snow Leopard. A blindingly fast box, but it lacked the "magic".
Several months I started hunting in eBay and eventually found myself a used G5 Quad for only $385! It had 8 GB of RAM and the Quadro 4500 video card. A steal at twice the price. I bought it, upgraded it with two new disks, one of which (the boot volume) was an SSD, loaded Tiger, and put my Mac Pro on holiday. I have been using the G5 Quad ever since. Equipped with an SSD, it is *almost* as snappy feeling as my Mac Pro... and it has all that G5 "magic". I have resurrected many favorite old apps that were only available for PPC and just love the total experience of being on PPC again - living PPC in an Intel world... I think different ...just like all of you!
I used to have a Powermac 7500/100 back in the late 1990's at work, and I started trolling eBay again a few weeks ago. I just picked up a complete Powermac 7500/100 system for $300, replete with an Apple 17" monitor, system unit, original keyboard and mouse, and most of the manuals. I am getting one of the 200 MHz PowerPC 604e upgrade cards for it, and I will have a fine old antique on my hands when done. It is running Mac OS 8, and I have managed to bring back to life a whole bunch of old stuff I was still hanging on to from back in the late 90's - fun!
Why PPC? Its all in the "magic". Plus... my G5 Quad is almost a screamer. A very fast and very capable box. Apple builds good kit!