Comment: Re:Cheaper iPad 2 (Score 1, Informative) 469
The fundamental difference, as I see it, is that a 5 year old PC still works perfectly fine and can run most modern programs now-a-days just fine (so long as you've taken decent care of keeping crud off it). Good luck doing the same thing with the iPad: assuming it still even works 5 years from now, the battery life will have decayed to the point where it will be barely usable, and if you think you will have the newest version of the OS available on it, excuse me while I laugh my ass of at your naiveté.
You're comparing apples to oranges. Most 5-year-old PCs won't run Windows 7 very well, if at all, and have no chance at Windows 8. Most iOS software doesn't require the very latest version of iOS to run, so it should remain a very useful device. Heck, iPod Touch 1st generation and original iPhones can only run up to iOS 3.x and still sell pretty well on eBay. They are almost 5 years old.
As for battery, just get it replaced for $99 if you still value your device, but I think "barely usable" is an exaggeration. Again, original iPhones are almost that old and retain over 50% of their battery life. A 5 year-old iPad isn't going to be a use-all-day-without-recharging thing, but it will still be a very usable device.