Cindi, I like how you think, you've helped add at least a half dozen new excuses I can use.
Others to use:
I had to buy that many to get the discount!
I know I could have waited until next year when the price goes down, but who knows at my age if I'll be alive that long.
I have to have some of the newer pretty ones to post on ATP
I don't drink or smoke, so I have to have some vice!
I lost so many in the drought, that I had to fill the empty spots.
My yard just wasn't balanced, I needed to add that extra bed to balance things out more.
I needed more of _______ color, to make a prettier picture.
I needed some later bloomers to extend the bloom time.
I'm sure there are some creative thinkers out there who can keep adding more!