At what point is it "Cheating"

I made my first actual purchase of something that is not necessary. I bought a Llama bro tank and a coozie. I thought long and hard before I made that purchase. Yes, I do not need a bro tank. I have enough shirts. But I wanted one to remember my first Llama and the successful completion of my freshman year. I realize that there will always be bro tanks coming in and out of my life, but the Llama 2012 shirt would not be available for a long time. So I bought one. I regret nothing. I did not simply purchase something random, it is not a shirt that is trendy and will be uncool next year. If anything, I plan on keeping it around for a while. It would be pretty cool if I wore it to a reunion. I do not think that owning this tank will improve my life quality or is needed for my CC survival, but it makes me smile and think about freshman year.
  ( now that I have a coozie I have found it to be quite useful and wish I had brought one into my life sooner. I use it as a wallet, to keep the ice in an iced coffee from melting etc. everyone deserves a good coozie in their life. therefore the coozie does not apply to the no stuff rule)