Toll booths do not scan Magic Bands. You flash the resort parking pass that they give you to go through toll booths. At the resorts they either scan your Magic Band, check a list (which isn't always right), or check your drivers license (useless as well).
So technically you can skirt the system. And I will tell you why and how, the self parking areas are for resort guests as well as day guests. When I looked, 3/4 of the cars in this lot did not display a parking pass. How or when they will crack down on this is anyone's guess.