Quick example for you, then. I log onto my main account, and lo and behold, I find a adamant scimitar on the ground. I don't really need it, but my pure does. So, I drop the scimitar on the ground, log onto my pure, and pick it up when it appears. However, they can be botched up. Speaking from experience here I've intercepted two drop trades and gained 500K+ from them combined. Don't do it. Too risky, and it's against the rules anyways.