Hunter: Grimtotem Spirit Guide no longer tamable (src)
Grimtotem Spirit Guide can no longer be tamed but those who have it will not have it removed by Blizzard.
"Through a hotfix we have recently removed the ability to tame a Grimtotem Spirit Guide. Players who have already gone through the trouble of taming the creature will be able to keep them unchanged. This hotfix only removes the possibility to tame this creature from here on.
The removal of the spirit guide has been debated within design discussions for a while now as to what impact the pet and its precedent has on the game.
The unintended nature of the taming, the undead status of the guide, appearance of the wolf in relation to the feel of the hunter class, and the complex processes of taming were all issues touched upon and discussed.
Ultimately the discussions brought us to the conclusion that this should not be a permanent addition to the pet selection available to hunters; however, those that have already tamed them should be allowed to keep them due to their efforts in obtaining one."
Plate wearers, repair costs and upkeep costs (src)
"While there is some flavour aspect (plate takes more effort/materials/time to repair than cloth, for example) associated with the difference in repair costs for each armor type, the primary reason for the difference relates to overall class upkeep.
Each class has an upkeep cost, which includes things like purchasing reagents, food and water, etc...
While a cloth wearer may spend less in repairs than a plate wearer, he will likely spend more money on things like reagents.
Note that its not important for all classes to have completely equal upkeep costs. The goal is simply for each class to be fun and burden free."