Grinding (World of Warcraft ui)

This may sound stupid but many ppl dont do this:

When your grinding for example WPL ruines of….. for epic drops the mobs drop loads of items that might seem of no falue and they leave them on the body.This is a waste of time and money.For example they drop the mushrooms that might seem useless but they sell for 40s to a vendor the stack.And why shouldn’t you pick up this lil extra money while your there?When your baggs get filled up you can always trow it away so you can just as well carry it around.

Like I sayd it may sound stupid but grinding is stupid if you ask me let other ppl do the grinding for you but when your realy going to grind take all the items for the lil extra.