I have 3 and looking at #4. My main work horse is my Bernina 440 QE. I have a Juki for my quilting frame. I have a cheaper Singer that I use when I make bears (the fur and the leather etc. wears on a machine, I can afford to replace the Singer more than the other two). I'm looking at #4 a small simple machine to begin teaching my GD how to sew with.
I know some people are like me, different jobs = different machines. Some people are collectors and God love them, they keep the history alive and visible and cared for.
I guess everyone is different and has different reasons and priorities?