I can only assume he was being asked by the public and he was obliging. I probably made a nuisance myself but there is only so many times you can refuse various people asking you to rev it ;-)
It was a lovely day out and good to meet fellow maser owners and put a few more faces to names. Great Maserati turn out, all topped off with some great Bristonian hospitality! @adamn
Adam - Have a look here http://www.gtspirit.com/2013/04/23/gallery-bristol-italian-automoto-festival-2013/
Plenty of more pics and vids - http://www.biamf.co.uk/links13.html