hehe, thers a lot of peole that thing like that.
I'm lucky I get a subscription upgrade with where I work, but if for any reason that went I wouldent be to bothered, theres probably loads of great things that have been added but I probably only use about 3 things on a regular basis that you could proabably get a MEL scrip for anyway (slide edge tool for one) since version 6 that I started with, other than that its just a bit more work!
I think that Autodesk (alias too when they had maya, not pointing fingers) just keep up with pretty much everyone else on the update stakes, says a bit about the times we live in (look at cars now, theres always a new version of a model).
The only big thing that I can thingk that you mighe see is that the names ofthe menus have changed, modeling has now gone to polygons and another menu called surfaces (for nurbs)
Suppose that at the end of the day you dont have to upgrade, but you just might feel a bit left behind (like buying a computer and then a few months later a newer one with .1 of a gig faster processor comes out, or a mobile phone that has a better camer etc etc)
"No pressure, no diamonds" Thomas Carlyle