I'm an American, and I would happily pay for a subscription service to the various BBC channels. As it sits now, the only was people like myself have access to this content is via torrents / pirate streams. The BBC shows are the only content that even registers on my conscious, and "BBC America" just doesn't cut it. I too wouldn't ever want the programming to change from it's Britishness...in fact, that's one of the major reasons I enjoy it is to broaden my cultural knowledge. The amount of income from the potential subscriptions is probably in the millions, and that's just in the USA.
I'm already enjoying much of the content, if I could pay for it I would. The same goes for CBC in Canada, CH4, Space, etc.