It depends on where you're from. If you need a VISA I assume you're not from the EU. If you immigrated from a wealthy country, then go for it. Worst case you go back home. But if going back home is a problem, then you'll probably have to either bite the bullet and save harder (You can probably save 10k/year or more in france with that salary if you try hard enough) or "ask nicely" for a raise, but don't expect much.