I moved from Ireland to Germany, where I was shocked to discover the stingy as f*ck data allowances that many German networks have. Sure, they have LTE everywhere, but what use is that when you are capped at 400 or 500 MB? It's like having a sports car and only being able to drive on a short track.
Now I can get a great deal in some other country (perhaps one with a low cost of living), and simply use that, with better service and lower cost.