It only works if you have a garuntee that you can be a shut in till the day you die. Other things to worry about is getting health/dental care.
I've been a shut in for 5 years now, I was pretty content and happy for the first few years. It was only until my parents started having financial troubles and begun the process of divorce when it turned into hell. Everyday I'm terrified by the thought that one day I'll have to go back to society. I knew some people that went through this and they have mostly ended up homeless because they simply were too under qualified to get a job. Health care is a problem too, I do my best to stay in shape and eat healthy foods to prevent any major illnesses because if I were to get sick it would mean severe debts as I have 0 savings.