I do believe that support equipment mean to help player not frustated enough when getting killed in dungeon and lost all of his equipment.
But i find it pretty broken and can fucked up the economy because some class or player abuse it. For example grinding with support equipment in hell castle is pretty easy if u at lvl min 21. Just play>loot>quit and suddently the market flood with epic equipment even the red one with cheap price. Those grinding seems not very rewarding after seeing how low the price of equipment lately.
Killing an enemy also doesnt very rewarding since almost everyone just using those support item.
I guess make it u can using support equipment like 3 times a day/hour is okay instead u using it all the time. So the market can keep up and balance the price