Buying a PDA on eBay

I just recently bought a Tungsten E on eBay, and I'm disappointed with my purchase. After noticing my battery was drained within one day of use, I noticed on the internet several posts about the E having a battery that wore out after 6 months or less. I would have to advise against getting a used PDA on ebay, and only buying new models. Although even with buying a new PDA, eventually the battery will stop holding its charge for very long. Its a large problem since the Palm battery is not replaceable. I've read this is a common problem with many lithium ion battery powered products like mp3 players. Why would somebody pay 200 dollars plus for a device that will function optimally for only 6 months to 2 years?