Jeff,
At a club I'm very familiar with, cart revenues, after expenses made a significant profit, but, unfortunately, the revenue dedicated to carts, then to the green budget was diverted and made part of the club's general revenue, sort of like the gasoline tax and our Government.
Paul,
You and Ben aren't living in the real world.
Yes, we'd all prefer cart use at a minimum, but it ain't going to happen.
One of the determining factors is cost.
If it costs $ 40 to take a cart and $ 60 to take a caddy, which choice is the low cost financial choice the golfer will make ?
The real world answer is the cart.
Clubs have to develop a prudent cart/caddy platform and pricing mechanism that encourage caddy use versus cart use.
I thought that you and Ben would have been able to figure that out without my help.