>The point of a demo is to convince people to purchase your game
But this isn't a Demo. They are already milking the back end by selling DLC "addons" to the base product that were probably developed in tandem with the base product. Now they want to sell PDLC "addons" to the product by releasing bits of it early. I'd bet the programmers/developers won't use much if any feedback from the PDLC people as they will be too busy trying to get the base product out the door as well as the DLC content that is to be sold immediately after the base product.
So, in some respects, it is ingenious. Prior to the DLC stuff, you had:
"Base product" if that sold well then a lot of time later "expansion to base product"
Now the business model is:
"PDLC content reaps in big bucks", "base product (which gets smaller and smaller)" ,"DLC content "addons" reaps in more bucks"
Next they will start charging you for character generation, Saves, multiplayer, etc...