Ask a Warrior Thread.

Nothing, if you equipped it. Can't trade a Reverse/Timeless after equipping it. Otherwise, I have no clue. People have been hoarding Kradia's 1h BW GM Scrolls for Demon Slayers (even if they don't use BWs, they like putting out that idea so people will pay large amounts for useless scrolls), and using other scrolls on useless items. I saw a perfect Raven's Wing with only 126 att being sold for max meso, which is pretty dumb for the level you get it at and the time it would take to wait till 110 or so for a better weapon. I say if you can trade it, put it up for max meso, and look for offers.