Doesn't mean it's worth it. I know it's all about market tolerance, but if you factor out the ridiculous, and just weigh the performance and value of the machine without the nostalgia, it's not worth $650. The LCD backlight wears out with time, so what you have here is an old 15" PowerBook with a relatively weak backlight and slow processor. For $650, it's not worth it, and believe me, I loved my PowerBook. However, since there is no way I could survive with one, I wouldn't go back to a PowerBook.
I guess you don't understand why the sleep mechanism was changed, then. I also assume that you don't know how to switch the sleep function back to the PowerBook days. 😉 Mine behaves the same as it did when I had my 12" PowerBook.