no... because they all follow a regular, predicatable/logarithmic profitablitliy curve... no surprises there... they are simply profitiable to an ungodly degree, which allows for a similarly unfathomabbly large marketing budget.

Its the day-to-day grind-it-out midlist/marginal books where shit is really interesting... just how FEW copies can you sell and be profitable? Just how small of a niche can you succesfully publish for? how much money do you have to spend/how lucky do you have to be to actually reach that small niche market, and what does that marketing budget do to you profitability? There's a reason no-one spends a lot of money marketing poetry collections. :)