You make a good point about HD selling the entry level JD models and Deere getting their foot in the door for possible future business. My feelings are, if a customer buys a green lawn tractor and is happy with the reliability and the parts and service available for their machine, they will become repeat buyers.
I seriously considered a new Kubota CUT because there is a dealer less than five miles away, however, there are FIVE JD dealerships within half an hour of our home, and my favorite parts counter is only ten minutes south of us. If Kubota and NH had the multitude of sales/service locations and the online parts system John Deere offers, it may have convinced me to buy one of their products instead. But I doubt those companies will ever catch up.