EnoYls hat in den offiziellen World of Warcraft Foren zu dem Problem der Manaregenertion Stellung genommen. Seit dem letzten Patch regeneriert sich das Mana trotz hoher Spiritwerte sehr langsam.
Zitat:
In the most recent patch, some changes were made to spirit. The intention was to just make extremely high amounts of spirit give dimishing returns so that no one could accumulate enough spirit to out regenerate their spell
usage. However, the change did far more then that. The change was based around what your "expected" spirit values were for any given level/class and then had dimishing returns in both directions from this value.
Unfortunately, because of the actual numbers used, spirit now has very little in-game effect. This is NOT intended and will be corrected. Do not throw away your spirit gear. Our long-term goal will be to have both intellect and spirit viable for casters to use.
Please don't ask for an ETA, because I do not have one yet. Once we have corrected the change and once again try to correct the problem we were originally trying to solve, we will have a better idea. I would like to try to get it into a mini-patch, but it might have to wait for the next major one.
-Eno
Wie EnoYls sagt, war dieses Problem von Blizzard nicht gewollt und wird korrigiert werden. Er kann aber noch nicht sagen wann das Problem behoben wird. Er weisst die Spieler daraufhin, das sie ihre Spiritausrüstungen behalten sollen, da das Problem entweder über einen Mini-Patch oder mit dem nächsten großen Patch gefixt werden soll.
Quelle:
offizielle World of Warcraft Foren 
