It has a gimmick factor, so yes. In The Netherlands there are already supermarkets with digital price tags.

Good idea, maybe would have been better to spend money on a patent than a prototype. 

As someone else has mentioned, digital price tags are increasing in use as they decrease in cost, I'm sure it won't be too long before this sort of thing is a lot more affordable.

If anyone is interested, I'm willing to design and manufacture some cheaper version.