Just because it is hard for people who have the latest-greatest device, does not mean that it is generally hard: many users (I would argue especially the demographics that pirate) either still have or are newly acquiring older devices.
A 4S is hardly "latest-greatest", and having to specifically buy a different (and inferior) device in order to jailbreak definitely qualifies as "hard" in my book.
Read: http://news.ycombinator.com/item?id=4995559 (this was posted by me in response to someone else 7 hours before your comment, but it directly addresses your argument: concentrating on anything but iPhone 4 is a very "I have a lot of both money and knowledge about technology"-focussed way of approaching this problem that loses touch with the actual demographics that are being discussed when you look at piracy...)
