You can only ride one at a time!….I keep a hardtail in fine fettle in case a mate who doesn’t ride wants to join me on a one-off ride.
Otherwise I have too many other hobbies that divert funds from bikes.
I could have a new 5k bike each year (yes, I’ve just realised how much of a **** that makes me sound) but I prefer instead to have a motorcycle too, I also play golf, play squash, go sea fishing, coarse fishing, gym membership etc etc….I know I would be bored if I restricted myself to just the one hobby, in order to do them all and have the required equipment for each of them I choose to ride modest bikes and limit the number I own.
Currently have three; a road bike, a full suss and a hardtail.
The hardtail cost less than 1k to build, the full suss came to 2.5k and the road bike was 1k.