To kick the count out to the Say chat channel. Naysayers among you may say "well that's pointless," and they're kind of right -it doesn't really matter how many times you cast something, and the macro doesn't do anything else for you besides update a variable to keep track of that number.Xalit is entertaining himself before the expansion by crafting some macros, and he's come up with a pretty clever one that will count the number of times you cast a certain spell.
But it is interesting to see just how many times, say, you pressed the Fireball button during the raid last night, and maybe there is some use for this information somewhere (maybe checking the frequency of use or viability of certain spells or trinkets?). Might be a good macro to have when you want to know more about what you're casting.