Well, if you change country from a roughly US dollar-based economy to a euro economy (for instance), you cannot keep your AdSense account "due to reporting currency restrictions". The only solution they propose is straightforward: close your account and create a new one. Not only would you have to change all your ads in all your sites, a herculean task in itself, but you're never sure each and every site of yours will comply to their ever-changing policies. I let the good news for the end: you cannot open an account as long as the previous one is not closed!! So you have to remove all your ads, close your account, wait for approval, open a new one, wait for approval again, and finally create new ads and put them all again. Not talking about how much you can earn from a click on a "new" site, all your previous data being lost in the process. Any experience to share about this is warmly welcome