Because you seem to have zero desire to purchase the equipment to do it yourself?
Things we have done with our tractor just in the last couple months:
Mowing
Dragging pastures or driveway
Spraying herbicide
Moving manure
Moving piles of brush
Hauling wood
Hauling equipment from place to place
Taking the trash down the drive
Spreading wood chips or manure
Moving a ridiculous amount of rock
Getting rock out of the ground
Moving soil
I realize you’re not planning on doing all those things, but we didn’t, either, when we got the tractor. It’s amazing how things come up.
Dragging seems to be one of those things a zero turn just isn’t suitable for, unless maaaaybe you get a very small drag? But man, that’s a spendy piece of equipment to risk in that way. Perhaps you can plan on picking up manure, or feeding small amount of oats (so the birds will pick apart your piles) or really cultivating your dung beetles, instead of planning on dragging?
There’s certainly more than one road to Rome. If you’re just absolutely wedded to the zero turn, and refuse to entertain the idea of a second piece of equipment, perhaps an alternative to dragging is an option. Or teach the horses to pull a drag!