Ron Badour wrote:

I just want to know why some people have such poor posting
style. Is it intentional, or just a lack of effort?

I should have added a third choice, which I suspect is the answer -
which is that full-quoting is the default for OE - and you make no
style distinction between e-mail and usenet message composition.

Actually I have a reason for doing it but I am not obligated
to share anything with you.

You now have your answer.

Well actually - not really. But my theory stands.