<marketing speak>We're at quite a large size already, having put > .5bn sterling through our system by now</marketing speak>, but more users is always a good thing!

Sure, we have a large user base in the UK and Australia, but really, those users are international - they're not all from those countries, and that's completely ignoring all of the European users we have ... so critical-mass is something we've pretty much already hit.

[edit: spelling]