Some thoughts:
-- While Sand Valley may be "remote," compared to the likes of Whistling Straits, it's not anywhere nearly as remote as Sand Hills, which is quite literally in the middle of nowhere, and far, far removed from any major metro area. Sand Valley is a moderate day's drive from 3 large urban areas, and given the state of the local, local economy in the Town of Rome and Adams County, I wouldn't be surprised if caddying might prove to be a decent option for local employment.
-- I wonder if the constrained nature of the golf season in central Wisconsin may play a role in the cart decision. This is no year-round place like Bandon -- the season is May to October, with some hot and muggy summer stretches, and the first and last two weeks of that season can be quite iffy. Carts are often viewed as a no-risk money-maker for golf courses; will the reduced golf schedule at Sand Valley lead to carts being an economic decision for the course(s)?