One from the other week, was on a recent shopping spree in London but most of the Jermyn Street shops were closed by the time I got down there. Luckily, Boggi was open so I picked up this shirt, as worn here with a Brooks Bros tie:
Probably. It could also be something to do with being confident in their looks - and being slightly extrovert. Having said that, I do agree with you somewhat - though there may be a bit of vanity thrown in as well!