Don't ask me for anything!

I know this is a really petty thing to get annoyed with, but I can't stand it when someone asks me to make them something and I go out of my way to get/make it for them and then they tell me that they already bought it from the Auction House cuz it was cheap. I mean like WTF! Next time check that shit before you ask me for something. You would think it's just common courtesy but  maybe isn't so common I guess. I was nice enough to say "yes" and wasted a hearth to come and grab the mat if I didn't have it already, and for nothing. Blah!