What happens to Dragons' Den investments after the cameras stop rolling?

Interesting piece in today's Sunday Telegraph showing that over half of Dragons' Den investments fall through after the show (in the UK at least)

http://www.telegraph.co.uk/finance/businessclub/money/11425328/Half-of-Dragons-Den-investments-fall-through-after-the-show.html

Bit of a shame really that it's just another made for TV affair and not a serious business thing.

There are a few that have been successful though, you can filter them in the interactive piece the research is based on - https://www.tigermobiles.com/dragons-den/. Looks like Peter Jones is the guy who puts up the cash most often.

Looking at some of the accounts for a selection of ones I remember watching isn't very pretty though, many of them are just scraping along.

Anyone have any info on other parts of the world seen as though it's shown globally?