You wouldn't play golf with just one club in your bag, Tim, so I'm sure you'll work out that your K-S1 will still be the go-to for street, macro, hiking and wildlife, just as the K-S2 is for me.
The K-1 can be your big boy camera with big boy lenses, if you wish, for everything else.
Not all of us need these expensive things, but I have friends who now have a boat, a custom car or shares in a racehorse, and the money I've put into photography versus what they spend for their fun is pretty good in comparison, actually!