And oh, that pyramid-quote suggestion....that's more important than you think. I swear, if someone quotes a bunch of text that need not have been quoted, I'll often not even consider meriting that post, even if it's decent. People don't like to scroll through shit they shouldn't have to, so that's an excellent point.
Pyramid- or nested-quotes are sort of lazy way of posting. It mostly comes from spammers and such reply usually has very low quality.
Sometimes we need to quote other posts (even nested ones) for fully transparent, avoid censorship etc. but mostly we don't have to use nested quotes.