I attended one of these bootcamps with zero coding skills (I waitressed & had two jobs before I attended) and had major difficulty finding a job as I learned a ton of incorrect information.
It took me almost a year, until I found an unpaid internship, followed by another company who hired me because they found I had potential. I learned way more from working with companies who took more time to help me develop my skills than the main instructor at the school I attended. It was both embarrassing and frustrating to find that I was neglected to the point of learning false methods. Not to mention that the main instructor spouts so many prejudices against software practices/languages (TDD, Ruby, etc.) that it could influence a person against marketable skills that are actually fairly valuable.
The thing that's made me hirable to companies is my determination to learn, and my ability to learn. Books, projects, internships or positions at companies with CTOs who are willing to take the time to say, "Hey, you don't know this. Learn it." is what will get you far, not a coding Bootcamp, in my opinion.
Alternatively, if you want to be making 6 figures, the school's networks are amazing and they will definitely hook you up with jobs. I didn't get the chance to use the network too much, but I know that others have landed jobs immediately, and with great companies.
I would say, if you have a ton of money, want the connections, and you're fairly technical already (ie. you know how to do some coding), this is for you. Otherwise you are absolutely capable of learning to code and find a job on your own. There are billions of resources online and at meet-ups that will give you a similar curriculum, basically for free or very little.
To answer the 'Why would any one hire you?" -- They won't unless they really like you & your potential to grow.