The perception of offering charging for any type of access to your apartment enhanced or not would be perceived negatively. Consider an apartment where the landlord charged you $1 every time you want to use the elevator, but you can always walk up the stairs. While one might be an enhanced way, I think people would still view it as the landlord double dipping. I think this product is much more suited to be a promotional feature subsidized by an outside delivery company (pizza joint) or the landlord to show off fancy bells and whistles in his building to entice new renters.