I think each store has its own bread and butter items they use to pay the bills... Over here i know quite a few store owners, some sell mainly small common fish as their money makers, some sell pre-setup aquascapes with stock as their bread winner...
So i would say its really doing research to see what your area would have high demand for and cater to them and add something special on the side...
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I think it's either or as well. A place over where I live said they buy blue tangs at a wholesale price of about $10 and resell for about $55, and they sell about 30 a month so there is big profit in livestock but it's all really depends.
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