Speaking as a guy who has been trying to decide what tractr\or to get for quite a while now, I think the market is filled with people who make their purchase decision based on little detail differences (other than color!) between machines. If someone has price as a big consideration, the option of having a cheaper loader available might make or break a sale.
It also gives the buyer a chance to feel that JD will build a tractor just for him, sort of like a tailored suit, instead of just picking one off the lot. In my shopping around, that's one thing JD seems willing to do that others don't seem eager about. You can "build your own" on the website, specify tires, hydro valves, tranny, etc. By comparison, other brands seem about half as flexible.