Maybe the cost savings of tagging the more expensive items can make paying for the cheaper items part of an honor system. I.e. pay $X monthly to have unlimited

Maybe the cost savings of tagging the more expensive items can make paying for the cheaper items part of an honor system. I.e. pay $X monthly to have unlimited access to item Y. Or, untagged items are locked. They are unlocked with a credit card, and the weight difference is billed to the card. Those are just a couple off the top of my head. I suspect there are many creative ways to deal with untagged items.