Orian,
Please desist from posting things that are based upon sheer speculation.
First, if you see Amis' route as the easy one, go and publish that number of works yourself.
Second, all the reports suggest he is paid in the region of 80k/year - not half a million - and whether he is, or isn't, worth that amount of money is frankly none of your business. We live in a market economy, the fact that someone was prepared to pay him that much suggests that he is in fact worth that much money.