The same reason the US moves more of the worlds money through commercial and investment services hosted here. Ask anyone in the EU who has lived in one country

The same reason the US moves more of the worlds money through commercial and investment services hosted here. Ask anyone in the EU who has lived in one country and earned a paycheck from a different one. Anyways, give it time, the EU is currently working to make it's tax system more complicated to solve some of the long standing continental issues, and to make the EU system more like the US one.