Funny thing happened the other day while I was "Donald Duck's Minder" in the Walt Disney Studios, a guest offered me 500 euros to let Donald Duck ride on Crush's Coaster with his little daughter. Obviously, I politely told him he couldn't ride.
Only face characters are allowed to go on "selected" attractions, if the permission is obtained well in advance through Special Events and normally it is only with a child who is very ill.