The 48 hour rule

There is a shopping rule that says that "if you see something you desperately want to buy, wait 48 hours to get it." It has partially worked with me, but what i do is actually purchase the item and wait 48 hours to see if i like it. If I don't, then I return it. I don't know how many returns i have done if the past year. That actually makes me feel good, the only problem is that when i return, I never have the original receipt so what happens is, I get store credit and then that gives me license to shop again. Bleh....I need to work on that a little bit.