The basic concept is as revenue grows profits will follow since many costs do not grow at the same rate as revenue; unless you have an unusual way of accounting for costs. For example, sales and marketing costs should grow at a much slower rate; unless of course you include shipping costs as part of sales and marketing, which they should not be but doing so would mask your true cost structure.
Explain then how Amazon gets away with little to no profit every quarter even though their top line is growing.
Apple introduced a lot of products towards the end of 2012. Newer products will have higher costs in the beginning won't they? In the same period in 2011 what did Apple release besides the 4S?