Mint obviously doesn't want to go through the effort of customizing versions of the software for different markets. (Which, in the financial sector I'd imagine is substantial work) My thought is that they feel there is much more market to win in the US without a similar expenditure.
What an enterprising young person should do is - call them up and offer to do the work for them for a single market. You could take the risk in terms of the full cost of development and negotiate a cut of every user from the country in question.
Unless they can see expansion in the very near future, they should jump all over this deal.