Clapping the batsman in

As far as I know "clapping the batsman in" is something that you are taught to do as a child, but then soon forget as soon as you get past about 10 years of age. After all the batsman hasn't achieved anything yet so why clap him in?

So it comes as a surprise to me that clapping the batsman in is making a comeback in friendly cricket around the UK apparently. We played a team on Sunday who gave a veritable ovation each time a new batsman came to the wicket...I can't see the same happening in club cricket in Australia.

Why are youngsters taught to clap the batsman in, and does it happen around the world? Answers on a postcard please...or in the comments box...