If you sell it, you sold it. Not yours anymore.
In a way, basic rights to ownership are under assault from companies and their quest to protect their walled-garden profit models. With something like a cell phone (computer) its completely insane to me that a company would come after you for doing anything you wish with it once you exchange money for the device. If I want to hack it, pai t it orange, then throw it in the corner and urinate on it, well then that's my right damn it. I get that modifying devices creates all sorts of uncertainty in behavior for software installed in 'walled garden' ecosystems, but if I want to leave it and wander I to the jungle then that's my choice. Besides, I don't think it's really about protecting the user experience and safety (viruses etc). I think this is mostly about the manufacturers protecting their ability to enforce DRM on a range of offerings from their partners. You see this with Apple and Google refusal to allow tethering software in their app store so carriers can charge you over $30 a month to use data you have already paid for. The jailbreak community buys a tethering app one time and does this for free. Sorry carriers.