One way is to have three core rules books which are mostly cut and past from the first one.
True. My family and I were playing a campaign a couple years back and this was annoying. Plus the ridiculous number of splat books. They were clearly trying to milk as much as they could but made it totally unappealing from a customer perspective. And add in the narrative dice that were proprietary so they were a pain in the ass to get enough to, you know, actually play the game with more than one person rolling at a time...
I have enough stuff if I ever want to run another campaign but they really messed it up.