I moved to the country and knew I would never be cutting this new place with my old 21" walk-behind mower from suburbia. And yes, the ZT mowers are expensive, and so I hired out the service for 10 years to people who had their own ZT mowers because I wasn't ready to buy one and didn't have time to spend on the yard.
But as the price rose, particularly after a recent attempt to raise the price by 50%, I decided enough was enough and bought a $9300 (incl tax+delivery) Kubota ZT724 model. To be sure, that's awful close to the $10,400 I paid for a new Honda Accord I bought in 1987. However compared to what they wanted to charge me going forward I have this sense that the money I spent on the ZT mower is like printing money. Every lawn mowing I do pays me back what I would have spent, and the mower will be fully paid for (from what I saved on hiring it out) in under 2 years.
Could I have used a cheaper mower? Maybe. My yard is no picnic though, and I'm no light frame to be hauled around either. The Kubota is a tank and hauls me with ease. I do have some nits with it, that I'll write up in another topic someday, but by and large it's good and paying for itself. I would have loved a diesel model, but that was just too much for my needs.