I think because everyone wanted to do all their AF quests as quickly as possible, so they can say they got 7/7 over the weekend. Then they realized that doing this would cost anima. Then they realized they ran out of anima.
Having gotten 7/7 AF they had little else left to do then post on the forums about how they ran out of anima.
It's sort of like when I save up all my allowance, then suddenly want to buy all the Hildebrand posters, pictures, stories, and memorabilia I can all at once!
Then complaining that I have no allowance left to buy anything else.
After a while, with nothing more to spend their Anima/Allowance on for a long time, they will forget their Anima woes and things should be back to normal.
Until next time they release more stuff and everyone wants to dash around as quickly as possible ^^;