It’s not a new idea but i’ve always “wanted” to do something similar with beer at a long bar with many many kegs of craft beer. Idea is to make sure all the product ends up moving and nothing stays untouched. Massive train station style flipping letter/number signage behind the bar with updating prices every 15-30min or something if it’s busy. One of the laundry list of reasons this is just a pipe dream is alcohol pricing like this is definitely illegal where I live.