Repair costs are pretty low when you can repair your own gear. We don't really need more chests, things got better since 2.X in terms of chests and loot, any more for dungeons at this point would just feel overkill.

And if you really want to get potions to take care of repair costs...for some reason, just go to HoH and get stacks of max potions, you never lose gear durability there.