Why? If what you have is working just fine, why upgrade? I've got 2 13-year-old minivans and they work fine and still look fine. Should I upgrade?
I am still using 98SE on this computer and it has about the same number of problems as my XP machine at work. It can run for days turned on without locking up. The XP machines do more strange things than my 98SE. They seem to change settings by themselves and then later put them back the way they were.
Personally, I don't think that's a fair analogy. Look at it this way: more than likely, the manufacturer of your minivan is still supporting your vehicle. A part breaks, you'll be able to find a service station that can repair or replace it.
Microsoft has turned its back on Windows 98. (Just like Apple has on is Mac OS 9). It is now officially an unsupported operating system. They don't sell it, nor support it any more. If you have a problem with it, you're out of luck.
Yes! You would have helped the GW Bush economy!