my two pence
Honestly, for me, the interface look of iOS 7 was shocking at first. But, eventually I got used it and now like it. While it still looks like it is meant fan of hello kitty for tween girls, the flatness looks nice (and I had been known to use pastels in my graphic work, but I digress)
Anyway, the only reasons why I jailbreak is not for piracy. It isn't to change the themes. It is for tweaking the operating system. I am a developer, I made bug reports and change requests to get certain features implemented, and they don't. iOS is a modified OS X. Modifying a few select plist files is what I do on my own phone which I paid for, so I should do what I want.
I like how Android and BlackBerry and even Nokia all had an option that allowed you to download from the web and install unsigned code if you accepted the risks it poses. I understand that will ruin Apple's profits on third party stores if a developer chooses to sell from his website. But again, if he did, he will have to eat the hosting and credit card processing. So it would still work out in the end, since at the end of the day, people are still buying the hardware.
I like having root access to my system. I understand the risks and I should be entitled to do so as I please. Even by doing so voids the warranty, so be it. I like the ability of getting apps that Apple may think is inappropriate. I am a consenting adult. If Apple bans things because they contain nudity/profanity/etc, then they should ban Safari because you can get all the smut or even illegal content through it. It should not be up to Apple what is appropriate for me to buy or not. If they don't want to allow smut to be sold on their store, as it being their store, it is certainly their right to do so. But if they want it that way, they should then allow people other methods of obtaining said smut (as native apps are far superior to web-based ones). And if you may recall correctly, Apple never intended to have native apps. It was the original popularity of Cydia that caused Apple to change their tunes (no pun intended). Why they never thought it was a good idea is beyond my comprehension.
Look at the Mac App store as an example. That is a great example of the walled prison/sandbox and standard web purchases ecosystem works. Sure you had to go through hoops in order to even use the jailbreak, but that is exactly what the iPhone should allow too. And honestly, I think the percentage of people actually going to third party stores would be minimal for iOS purchases. But the fact they DON'T allow it is why people want the phone jailbroken. As for people pirating apps, I certainly don't condone it. But, I know of people that do, and it isn't about stealing. As they say, there are two sides to each story, and from what I discovered, it is because they want to try it out first. Besides light/free versions, there is no way to actually demo something before purchase. A few screenshots or a demo video on their website often isn't enough for someone to make a decision to purchase something. Regardless if it is $1 or a $100. If by pirating, they decide they do like it, they often purchase it. But if they discover it is a load of tosh, then they erase it. I think Adobe secretly condones piracy to a point that it is a way to reach the masses. Home consumers would never purchase Photoshop for example. But once they master it and know it, they can then tell their purchasing manager at their place of employment, it is all they know. A home user in this case is not a loss sale because they would not of ever purchased it anyway. But once they become experts in it, they can then demand it in their office where they would obtain a legal copy. Thus, a sale is the result of piracy. I think that stands true with iOS piracy, though I cannot vouch for everyone as I am sure there are plenty that steal for the sake of stealing just as one does with actual goods in brick and mortar stores. I remember fondly that BlackBerry had a three day trial with most of the apps in their store. It was great as I got to experience the app and decide if it is worth trying or not. The problem with light versions is also caused by the sandbox itself. If it were a game, your progress would be lost if you got the full version (especially with separate iPad versions, unless the iCloud was implemented properly).
And I think my two pence is now worth a few pounds since I went on a rather large tangent here, but just my thoughts why I jailbreak, why I did so just now with my iPhone and iPad. Despite the controversy, at the end of the day, I am able to use my device the way I want it to, not the way Apple wants us to. They make great products and obviously I was living quite fine without it being jailbroken, but after working my arse off to buy such toys, I should be able to use what I pay for the way I want.