Plain butter typically costs more than peanut butter, unless you meant to say margarine which is cheaper. (Regular butter, store brand, on sale 1lb ~$2.50; PB on sale, store brand, 1lb ~$2.00; Margarine, giant tub >1.5 lb of just about any ~$3)
We'd buy plain butter/margarine because it was more practical than peanut butter. With butter you can use it for other things. We couldn't afford the bonus of peanut butter.
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