This is mostly the case from imports, though, isn't it? Anything you import rather than buy locally is money leaving the country. That seems to be by far the bigger effect if that's what you're concerned about. Ireland's situation, if I understand it correctly, is still to pull corporation tax from Amazon sales in Europe, just at a lower rate. So Ireland is going to be a massive net beneficiary, even if you only take into account the corporation tax paid by Amazon and not the larger effects (other taxes; infrastructure investment; etc).