How about having a glass of green glow drink?
I made this drink up. But if you had never tasted such a thing, the chances are that majority will choose something familiar. This is also the reason rich companies get richer. It is safer to buy Mac than Zomzo (another made up brand).
It is easier to buy branded, well-established things. Also, it is safer. That is why people tend to stick to the same habits and purchases.