Have an npc outside of the hall of survivor, zurhidion stronghold, and hall of the demon lord that will, for diamonds, will reset it. The game is way past level 55, but those item set skills are still useful, and getting them now for those that need them requires too much work, or advanced bind lifters, to be as profitable.
I am aware of the time the instances were "broke" and repeatable, so it can be done. Having the npc do it for dias would help generate cash flow for the company, help in game economy by players buying runs, and the player base by getting the iss gear they could use.