The Z was an addition. Where I live, and the types of riding I do, it can't be an only bike. I have my 2013 Versys for long road trips, and longer day trips where I'm group riding and will have to go on major highways. I have a 2007 gsxr that is track-only.
I got the Z to play around with on the backroads. It just looked like it would be a lot of fun and it is! Maybe I'll look into the mini racing on the kart tracks...we'll see.