Yeah, I get that. When I buy a book, though, I don't really want to be buying a bunch of stuff I'm never going to use in order to get a bit that I will. Currently, I play 5e, using books that other people have purchased. I won't spend a dollar on the game myself, though, until I get some general release support, which means that I will continue to run 3e games. If/when 5e ever bothers to support players who want more than core material and setting books/adventure paths, I'd love to start running the game.
If/when I do start buying, I run the Realms, so I'll buy the Sword Coast book, but I won't be buying the Dragonlance book at all. I don't run that game and I'm not going to throw my money at a bunch of Dragonlance pages for whatever rules are in there that I might use.
General release books are something that a lot of people want. WotC threw out the baby with the bath water on this. 3e and 4e had too many general releases, but that didn't mean that they had to drop down to next to none.