Well, it's my money, and I enjoy new gadgets.
If being a douche is owning something you want, then we're all douches. I'm sure you spend your money in ways I would see as a waste, but I stopped giving a shit about a lot recently. Buying this would make me happy, something I've been having trouble with for a while.
I know I could get a smart watch for less, but this goes perfectly with my phone, and the fitness tracking actually seems really nice as I have a hard time finding accurate measures for when I bike, hike, and kayak all summer and fall.