"The spice must flow"

It's amazing how money has the ability to disappear without any sort of logical explanation, it's impossible that I spent more money in one week than I usually do in a month without any sort of major purchase. Why is it every time I decide to save some cash for something else it just seem to evaporate? and when I don't have any intention of saving money for a particular purpose it just piles up before something happens and I have to spend more than I want? I hate cosmic balance.