It really comes down to manufacturing cost. The designers have a price point to meet and few pennies over thousands of units makes a difference. Once you start letting manufacturing cost creep, where do you stop it?
It's easy for us as the consumer to think "it would have cost only a few pennies or a few dollars more, I would pay that" But then each consumer has their own idea what they are willing to pay extra for. Start adding up all those extra pennies and the cost goes up and profit goes down.