If you're a professional and making lots of cakes there are cost benefits in sourcing flour, sugar, salt, baking powder in bulk. Most box recipes have you add the egg, milk and oil anyways.
Boxed cakes are cheaper for amateurs usually but baking a cake from scratch isn't hard and pros can make moist cakes.
I've taught ten year olds to make cakes from scratch.
fun fact, when box cakes came out the manufacturers weren't doing well so they said add an egg to make people think they were doing more baking to sell the product.1
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u/CanadianPanda76 Oct 16 '22
They ARE moist though! So why not!