Honestly, I see it as very much identical to wearing resistance gear, when you need it, you put it on. I'd gladly use cloth with -stamina as long as I didn't die, if it gave the most DPS.
I always try to keep a little stock of items that, even thought they might not offer as much pure DPS as my current gear, serve their use otherwise. Examples might be +hit gear after you're hitcapped, just in case you need to swap out some of your regular gear for resistance / stamina, etc.
Lessons of Maraudon: Never sell / disenchant anything that might be of some use in a different situation, but don't use that gear as your normal gear either
