How many of them want to do it for the freedom of installing apps that aren't available in the App Store, versus how many want to just install App Store apps without paying for them?
Of all the people I know who've jailbroken their iPhones, I know exactly one who wanted to extend the system capabilities of his iPhone (he has some cool mods that let him make wifi and bluetooth adjustments from the home screen).
The rest of them just wanted to get software without paying the developers for a license.
The problem with anecdotes is that other people can use them too: I only have ever met a single person who "just wanted to get software without paying the developers for a license". Most of the people I've met are addicted to the ability to change the icons and sounds with custom themes.
Of all the people I know who've jailbroken their iPhones, I know exactly one who wanted to extend the system capabilities of his iPhone (he has some cool mods that let him make wifi and bluetooth adjustments from the home screen).
The rest of them just wanted to get software without paying the developers for a license.