But when did you buy the QuickSilver? I'm not talking about ditching the PPCs you still own. Lots of us have PPCs that have been our workhorses for years that are more economical to continue using than to replace. My primary setup at home is a quad G5. I wouldn't buy another though when I can get a Mac Pro for the same price or cheaper. I still use my PowerBooks all the time, but I'm talking about somebody who is out to buy a computer to use everyday for their internet needs (what MOST home users are doing). If you're telling people to buy PowerBooks instead of MPB's and MacBooks, you're going to have some unhappy users coming back upset with the poor performance they're going to get. Be honest here, do you really believe that PowerBook is a better machine to use in 2015 than an Intel system? Just because you and I have the patience to deal with old G4s and G5s doesn't mean the masses do.
As far as computers for $80, you might have me there. Can't say I've personally picked up an Intel Mac for less than $80. However, I'm using a 15" MBP Core Duo 2.16 that works beautifully with 2GB of RAM in grade B+ shape and it was $81 plus $15 shipping off eBay in 2013. Fact is ANYBODY would be a fool to spend $65-$80 on a PowerBook when you can buy a MacBook Pro for $100 that is 5x faster than any G4 portable. I'm talking about people who are buying a computer to use, not as an extra toy. The price argument just doesn't hold water anymore. Here are some Intel systems I've picked up over the last 2 years off eBay that are all working and in good condition.
MacBook Pro 17" 2.6GHz Core 2 Duo - $167
MacBook pro 15" 2.16 Core Duo - $96
iMac 20" 2.4GHz 2008 C2D - $155.5
Mac Mini 1.83 C2D 2007 - $85.15
Mac Mini 1.83 C2D 2007 - 120.65
So thats 5 systems under $170 with 2 of them capable of running Yosemite. If you look, you will find. There are deals like this all the time online, and even more available locally for many when businesses, schools, and individuals are unloading iMacs, MacBooks, and other older Intel systems.