90% Jesus Christ, I hope your programming skills are better than your statistical hypothesis skills. That number is much lower.
I jail broke tonget folders on my iPhone 3G, a device that is too old to enjoy iOS 4, mywi for tethering, and backgrounder. Turns out the reason I don't let go of my jailbreak is because I prefer the text message app that I paid for as well as the quick reply app that I also paid for. I believe what drew me to jailbreaking again after not doing it was to tether my iPad. Turns out I've used it about 5 times and never again since.
As far as stealing apps, I don't steal in my every day life and I don't see even $10 for a useful app to be a lot. I've paid for a ton of apps in the iTunes store and the ones that I could not (BiteSMS, Quickreply, Mywi) I paid the dev directly.
90%Please. Let's face it, not everyone is a thief and certainly not 90% of iPhone owners who jailbreak.
So, you are one of the 10% then
The reason i said 90/10 is because some people do jailbreak to do the things you are stating here but just because you don't do it doesn't mean it's not done.
Out of all of the iDevices on the market I stick to my original statistic.
I think i'm being fair giving 10% the benefit of doubt.