Given that US and EU wages have about a 3-5x disparity, then you might think a) the US worker is worth that premium, and will fulfil 3-5x of your demand for work as the EU worker, b) you have a need towards hiring in the US (certainly understand this in some cases). Or... c) there is a disparity between supply / demand and salaries - why hire in the US if there is so much cheap supply elsewhere?