The cost of games has gone down, thanks to economy of scale, the cost has not kept up with inflation or development. That's why digital games are not cheaper. We already get the benefit of cheap games relatively quickly after release and many games are going F2P or have a cheap entry cost. I'm not sure what more you want.
Digital Deluxe Editions are just premium products to fleece people who are less discerning with their money, you can safely ignore them.