There's a thousand things I can tell you, as to why, but allow me to ask you four questions instead.
1. If I told you that I bought AC, and never used it, would that deter you from buying it, or would buy it?
You'd probably still think about it.
2. If I told you that I bought AC, used it, and saved money, would that deter you, or would you buy it?
You'd probably still think about it.
3. If I told you that I didn't buy AC, and never needed it anyway, would that deter you, or would you buy it?
You'd probably still think about it.
4. If I told you that I didn't buy AC, needed it, and spent a ton of money, would that influence you to buy it?
In this case, you'd more than likely be leaning toward it being a good idea.
I buy it every time, but only for the computers. I've needed it every time. In the event that I do not use it on a computer, I will be happy that the computer is still in good shape and will not miss the money.