I don't like mayonnaise. It's necessary in some things - potato salad, tuna fish; there's probably something else, but I can't think of it right now.
Bob, on the other hand, uses mayonnaise as a condiment like mustard, putting it on sandwiches. So, we keep it in the house.
Costco has both Duke's and Hellmann's mayonnaise. Last year, never having tried it before, I bought Duke's to try.
Nashville twitter and other media have been having a mayonnaise argument (#mayogate), with folks strongly committed to their mayonnaise of choice,
I'm NOT saying there is anything wrong with Duke's, and you can definitely get it at Costco. I'm just saying, I will be buying and eating Hellmann's in the future, and so will Bob.