Have a look at how operations in and around the Grand Canyon in the US (just one example) are regulated - bottom line is that there is good money to be made from flying tourists around the beautiful peninsula and it can and should be done in a regulated fashion which keeps the bunny huggers happy, the fly-by-night types out and the solid operators in business. (Around the Drakensberg the overflight rules apply and there aren't many complaints - perhaps it just takes better equipment to operate at high density altitudes...)