Why do I end up tempting myself?

Last night I made a sugar free Texas sheet cake, but it was after 8pm. It took all of my effort to not lick my fingers and to not take a taste of it. Tonight there is a literacy night as Isabelle's school and we preordered Chick-fil-a, before we started this competition. Now I just get to watch my family eat it, unless I want to loose a couple of points for eating it. Why do I do this to myself?