While they may not sell well, I don't think they were supposed to do so. It's a product for the most hardcore fans/collectors, which off course there are very few for any ban. Perhaps they were expecting more sales from people like us (diehards, but not over obsessed with having everything)?

I would be however surprised if they stopped doing this, as it is a pretty cheap product to make - they already record every show. And if they want to cut down all costs, they could always stopped doing pitch corrections for Jon's voice