And yet, Apple has a very low marketing budget with respect to their competitors...
http://www.tuaw.com/2013/11/04/apples-advertising-budget-dwa...
I think Apple recently doubling their marketing budget to $1b was taken with great fanfare, but still puts them far behind their competitors.
However, it is an open question whether Apple stores should be counted as marketing or some other kind of expense. It definitely helps promote their products, but the direct channel also helps with profits.