it makes logical sense that well witted armor would also reduce the cost of sneak. it would also make the armor more useful.
Because it doesn't? I don't know what kind of answer your looking for here. There is already a lot of ways to reduce the cost of sneak. Adding it to armor would probably let people find a way to drive the overall cost to zero.
Because who the *** knows, sneak is a confusing ass mechanic easily exploted when you do understand it and play a nightblade. Bad idea to just take skyrim sneak and put it in an MMO if you ask me.