Not me. Actually, my Cub Cadet 60" Tank commercial zero turn is a tank. Festooned with grease fittings and very robust built. Other than an infrequent spindle failure ( and I rebuild the spindles with new grease seals and bearings (which I always pull the inner seals on so the bearings can actually get grease) and the infrequent belt replacement and idlers, I fully expect it to last for many more years. It has around 900 hours on the Kawasaki. Valves get adjusted every fall, air filter replaced, oil filter replaced and fresh oil and twice a year I remove the shrouds and blow off the chaff that accumulates in the fins. If the motor fail, it will get a Pred. New blades every spring, I don't sharpen blades, I replace them. Getting time for new tires.
My wife has a CC RZT with the Courage motor that burns oil. Not a lot but I have to keep an eye on it. Not built nearly as heavy as the Tank but sho don't mow as much ground as I do.
Not about to buy a new one (either model). I'm quite capable of keeping them operating. Besides, the inflated cost of a new zero turn keeps my old ones operating. Get all my blades from ASC and have for years but I buy other stuff from them as well. Between them and Shoup, they keep the farm in replacement parts.
It's my contention that most non commercial mower owners don't perform required maintenance and basically let the machines go to hell.