You can do whatever you want with your device, but say, like if it was a car, if you open up the hood and start playing around you are responsible for your actions and the manufacturer won't fix your mistakes for free.
I put some trust in Apple because I bought their products with my money, its a public company, transparent, has a privacy policy, has official support, product guarantees, recall programs, and there is someone to sue if they break the law or deceive their consumers.
We all know that the "warez" community does not come with any guarantees or official support. Unless the app or product is FOSS then you can not know whats going on in the background, and even if you discover it you can't do anything about it because no one gave you any promises. If you can sell me a jailbroken iOS and apps with a promise and gurantees like 1Password, Carbon Copy Cloner, and Adobe then yes. Some random dude who uploaded a modified iOS on GitHub with the first sentence in a ReadMe.txt file stating he is not responsible if anything goes wrong... no.
You have the freedom of choice, but given how much private data a smartphone carries today and how people rely on it for their day to day lives including its $600-800 price tag...its just too dangerous for most people.