Circling the wagons

Is it bad of me when I consider buying a minifridge for my room? I'm having some problems with some items in the common fridge being "misappropriated" by my roommates, and I'm getting tired of it.

Am I just avoiding the problem? They're not too cheap, but I think it might save me some headaches in the long-term. It might also encourage me to remain at home more often -- I would know that I have stuff to eat and drink in the apartment.