Life would be too boring with only a couple bikes. Let's see:

1 carbon road bike that is my go-to bike.
1 steel road bike that is set up on the trainer.
1 carbon gravel bike that gets ridden regularly on its intended terrain.
1 carbon FS XC bike, I usually save it for racing.
1 carbon enduro bike, I use it for the uber-technical hike-a-bike terrain up here in the mountains.

So 5 bikes, I want even more. I do have a pretty nice 25 year old Cannondale CAAD 5 that I never ride, but it's too cool to part with. Full Dura-ace and painted in the Saeco team colors. I could justify adding another gravel bike...gravel riding is a spectrum and not just one style of terrain. I'm also going to be building a lightweight carbon road bike up as my "climbing" bike, to compliment my main road bike.