The thing is, someone is going to have to scroll, no matter where you put them. If one person comes to the post, reads a bit and then decides not to read more and wants to move on, having them at the top is a good thing for them. If they are at the top and someone reads the whole post and then wants to move on to another post, they have to scroll clear up to the top of the post in order to get to the previous/next button.
In some cases these can be moved with CSS if you have the Custom Design upgrade, but it all depends on how the markup (XHTML) and the CSS is organized. In some themes it is easy, in some themes it is difficult, and in some it is impossible.