Yup bonkers, it's why I don't wholly get DLC to some extent, I think the only time I have likely appreciated dlc is with the witcher 3 and that's because they were essentially additional games.
As with all things though people just accept it as the norm and there are people that must pay for all the additional crap (in fact for my jrpgs I remember seeing some dlc, can't recall the game but you could pay to have the girls in the team run round in bikini's, I mean wtf is that about?)