Ren –
What benefit would be in it for the bar owner? It would be interesting to the patrons… but interesting enough to drive business to the bar? Probably not.

Your asking bar owners to pony up $$ for this device… run power and wiring to put them in… in wet walls – so there are pipes and stuff in the walls which makes it a more complicated job.

The benefit is to the customer… but the expense and work is on the bar owner… Not a good business model.