It's one of those "helping or hoarding" questions. I think obsession/compulsion can be a serious problem to pet owners. The easiest line to see for other people is the lack of care given to the current pets because the one "has to have one more."
Also, once you begin making trade-offs between gas/food/bills/work/kids/etc, and your fish, you've become obsessive. But if you have a 5 gallon ready to go already, then that's just being a bettaholic, which we already know about. =] The tank on my nightstand is taunting me right now as I type this.