Sure they're worth their price. At least in the AG/utility tractor range. I got priced on 3 different tractors. A 18 JD 5075E, Kubota M7060HD, and a Massey Ferguson 2607H. All 4WD, open station, FEL models with the Deere and Bota having 12x12 power shuttle transmissions. They all seemed like good, capable machines, and all we're quoted within just a few hundred dollars of one another to me. Oddly enough the one that should be the cheapest based on features (the MF) was the highest priced unless I payed with cash. The Kubota was the lowest priced but again lowest to highest price was within a few hundred dollars of one another.
The point being that when you are looking at the larger, more established tractor manufactures JD isn't necessarily overpriced compared to their competition. I would expect Mercedes Benz, BMW, Audi, and Lexus to price their cars similar to one another, but I would expect to pay less for companies new to the high-end luxury segment trying to compete with these brands like Kia and Hyundai even if their cars are legitimately competitive. Same for tractors. I would pay more for a John Deere, NH, Case IH, Kubota, and MF than I would a comparable LS, Branson, Kioti even if they were as good. Would you tell someone not to buy a Samsung HDTV just because Vizio is a better value?