Why do people buy these "Real Dolls"?

I remember when they were launched I found them fascinating. Possibly because as a little girl I was “doll mad”. I used to drive my parents crazy whining for new dolls!!

However these dolls here are so lifelike and beautiful, their skin feels real, their “bits” are also very real. I watched a documentary on people who have these dolls and it appears that they have a fully committed love relationship with the doll. This is how they see it anyway. One guy even takes family photographs! One man had eight. They all seemed to have difficulty in finding a partner, but one said he just preferred the doll. What is behind this? I keep thinking of necrophilia? One man said he particularly liked their stoic, stillness? Would love your thoughts on this. As by the way they are very expensive too.