Does my customer have a screen showing the price of my item and the price of my competitors item. That's a very good question, and a very valid point.
In fact, they do. Many of them do, at least. Certainly, I use my cellphone to price shop. Even aside from all the apps for all the different cell phones, a couple pokes and prods on my cell phone will tell me the price of, say, Final Fantasy XIV at all the local game stores in my zip code, or city, or state through a web browser.
I still fail to see the issue with this, which is to say that I understand your point of view; I do however believe it is wrong. While there needs to be some tweaking of the things that affect the economy, such as the removal of goods, more gil sinks to keep inflation down, etc., removal of the prices - i believe at least - is not an overall benefit to the economy.