Why do people stick to name brand formula when the store brand is SO much cheaper?

My doctor first told me about the store brand right after my first son was born. Said that they were legally not allowed to advertise (Compared to Enfamil/Similac/whatever) if it were not the exact same thing. I cant help but wonder.. why then do people even spent 3x the amount on the name brand when they could get... show more My doctor first told me about the store brand right after my first son was born. Said that they were legally not allowed to advertise (Compared to Enfamil/Similac/whatever) if it were not the exact same thing. I cant help but wonder.. why then do people even spent 3x the amount on the name brand when they could get the store brand for so much cheaper?
Update: i dont know which is formulated for babies needing to gain weight? Im not in that situation so I wouldnt know...
However; I know at least at walmart their parents choice brand has a huge selection at least at my walmart they have a store brand for just about any of the name brands. They have soy, gentle, etc etc...
Update 2: also i would like to know how someone knows it tastes better?? My son actually prefers the store brand..
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