Up to some value of volumeDelta * productCount it actually makes sense to use the same container due to sourcing/manufacturing cost from the variance so I wouldn't say purely disingenuous, there is real reasoning behind some of it... it's just marketing gets in the way of when you should actually add that second container size i.e. it's costing you more to always use the bigger container but the marketing department says the increase in sales due to confusion outweighs it.