Yesterday I installed the release candidate for Vista Service Pack 1. There's no specific issue I've been waiting to get fixed. I've been perfectly content with the current performance of my system. So why would I install it? I'm sure that on Monday, at least one of my colleagues will ask me the same thing.
The reason is, to me, new software is like getting a new computer, or a new smart phone or a new video game console. I love new software. I can't wait to get my hands on it. I don't care if it's a new version, a major release, a minor release or a hotfix. To me, it's new, and there's bound to be something there to check out. It's something I can say I have.
Now, fortunately enough for me, in most cases, software is far cheaper than hardware. There's always something new coming out. Software satiates my need to buy new hardware (despite the fact my wife thinks I buy too much hardware already).
So, I know that Rocky Lohtka says it's too much. I say keep it coming.