I do NOT have a budget problem and am NOT paying $400 for an old technology. Quite honestly, the value of a $2499 MBA is greater than the value of a $400 OLD technology PB with a G4 chip.
The OP is asking of VALUE, is it worth $400. I merely explained why it is NOT worth $400. So, while I could afford a $1599 MB, I understand some cannot. For those who cannot or do NOT want to spend more than $400, I would encourage them to get the MOST technology for their $400... and that is the value in a Windows laptop for $400 over a four year old, outdated, PB.
So, why don't you worry about what the argument is and NOT what I could afford.
Best wishes to all. Happy Holidays.