Does cost = quality of food?

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My boys are Marshall ferrets and when we adopted them we were told that we had to feed them high quality EXPENSIVE kitten food for the simple fact that was all they would eat. After about a month of that we decided to try them on ferret food...however even the marshal ferret food costs an arm and a leg so we tried Mazuri. They eat it better than the kitten food! We have also given them marshal food to see how they did on it and they do just as well. They have no adverse affects such as diareah and they are overall healty. Does it matter what ferret food we give them as long as they like it and its not harming them? The main reason I ask is because I pay $10 for a 4lb bag of marshal or I pay $26 for a 25lb bag of mazuri at a feed store. that is quite a bit of savings and it saves me from having to buy ferret food every week, because lets face it, those guys can eat!