...the meth you make is equal to the bad you break.
I'm wondering about the state of a feature that was talked about in the recent past, adding a new calculation to the rng loot. As I remember, it would slightly increase your chance to have a specific item drop the more times the item did not drop for you. I'm wondering if it was ever put in, and secondly if it only applies to the newer Mists content or old content and if its just armor/weapons or pets/mounts too.
The "specific item" calculation doesn't exist so far as I'm aware, but there is an increasing chance every time you don't get an item from a bonus roll that you'll receive an item next time. As far as I know this only applies to bonus rolls in current content. Blizzard did say they want to institute personal loot for all 5-mans in the next expansion, though.