A: Because it disturbs the logical flow of the message.
A: Why is top posting frowned upon?
Your sig is incorrect because it is based on the assumption that new
information should be on the bottom,
however I can name thousands of things that have new information on the top,
and push the older information downwards.
The most important information, the newly added information should be on the
top for fast access.
If one is referencing to something in particular, they should add that
before their remarks, just as I did on this post.
If one wants to elaborate and find out what was said before the latest post
then and only then he can use the scroll wheel.
This system is more logical and more effective and natural to new users....
This is newsgroups, not a book.
I will make a survey one day and get a vote from as many people as I can
get, to see what the majority thinks is better,
but I will do it in such a way so that they will not know that they are
talking about newsgroup posting. Because in this case
the opinions will be biased.