@irontoenail - They aren't environmentally friendly either. I mean, if every single person on the earth had a burial vault, we'd be tripping over them in the street. The coffins that people use these days are bad enough without encasing them in concrete as well.
I think it's unfortunate that funerals seem to be such big business. It gets in the way of people being able to choose sensible options when they are being encouraged to buy big when they are feeling vulnerable.