There's been quiet a flurry of activity regarding Diamond's request that all publishers will have to supply UPC bars on their comics as Diamond is leading the way for comic book retailers to come to the modern world of retailing with POS (point of sale) data. Although some stores do actually scan the barcodes and therefore have a semblance of an inventory system (or at least access to one), many if not most, comic stores don't.
For most stores, moving to this type of system is based on cost of getting a system but Diamond is working with them to provide it at a manageable cost. It isn't the retailers who are flapping about it though, after all, they don't HAVE to use the system...but rather the publishers.
There have been quite a few protestations posted through out the internet ---see Comics...