How to recover your development cost in 2 days

Read today at MacRumors that Apple sold 2 million copies of Leopard in the first weekend. At 129$ per license they got 260 millions. At 85$ per hour programmer cost they can afford let’s say 3.000.000 programmer hours for the money they got in the first weekend. This will translate in 375.000 programmer days. Assuming that the development took 3 years this means that the money they got in the first weekend allowed Apple to pay for around 500 developers during that time. I know that the numbers are not very precise and I know there are other costs beside development but I still think the magnitude order is ok.