Ya, I totally get what you're saying, and it makes total sense. Here's the thing, you can already do all of that stuff on your user page right now. However, it's pretty tough and you need to know some HTML and CSS to modify your page. It's actually the same way that MySpace works, and you can see how customizable those pages are. We're not big enough to have entire sites dedicated towards creating ProdutWiki user layouts though :P
To make a system where it would be easy to move your pages around is actually VERY difficult and would take a lot of programming time.
So how about this for a compromise, I can help and show you how to modify the look of your page, and do it in a way that you'll be able to make changes on your own as well. I have to warn you that it's not going to be super easy, but the good thing is that you'll be able to apply the skills to other things on the web.