For all of you that have already blazed down the internationalization path, what percentage of your total sales are coming in from non US sources? We all know the US ecommerce market is more mature and of course it depends on product uniqueness and execution, but for the sake of argument assume that everything is done optimally - local translation, locally run PPC campaigns, all popular methods of payment taken into account, shipping from within the country, etc.
I know about 50% of Amazon's total revenues are non-US based, which is quite impressive, but it seems like quite a lofty expectation for us! We added Canada (easy and logical) and now about 10% of our business comes from there.
UK, Germany, Japan? Anyone tried these and care to share how substantial they are to overall sales?