Req 70 Hunter (may use boost)
catch an Imp in the box. Then enter a PvP world (Or any populated world after Feb first).
Take ONE imp in the box out to the wildy and wait for any decent drops (10k + for starters) and then pick them up and use on the box. This most likely will anger the person who earned the drop and he might attack you. If you die, you keep the 10K+ item in your bank, then loose the 500g box.
Before free trade this will make 50-100k an hour.
After free trade, drops appear to everyone and makes it easier, so you can make 50k-10mill per hour. (amounts over 75k unlikely)