They want the loadsamoney, no responsibility opportunity. My guess is they will be milking the royal Kardashians angle very soon.
First products: the Duchess perfume and cosmetics lines. Harry will get the HRH clothing line of smart shoes, shirts and suits, sold through Men's Wearhouse. The contracts are probably ready to go.
Occasionally they will do highly visible charity work, that will do little good for anyone that needs charity but the visits will do wonders for their brands.
O lente, lente currite, noctis equi!
The stars move still, time runs, the clock will strike,
The devil will come, and Faustus must be damn’d.
Yuck.