Personally, I think alot of it is to make us aware.
We don't usually give other people in need the time of day, because most of the time we are too damn selfish.
But if shows like this raise awareness, let it be.
The manner may be wrong, but take the Donna's Dream House. They are now getting a considerable amount of donations through the show. A well worth while course if you ask me.
Some millionaires do look greedy, and some probably do go in it for themselves. But it's amazing when you see some of the millionaires and the journeys some of them go on to realise how greedy they've been and how to make a change. E.g. Gary Eastwood.