“Per the Terms and Conditions of the Nintendo Loyalty Program, some users? Stars will begin expiring at the end of June. Stars that have been in your account for 24 months will expire at the end of the 24th month. Starting 1 June, you can log in to your Club Nintendo account to see if you have any Stars that are about to expire. If you spend your Stars in June, the ones about to expire will be the first used for purchasing items. Learn more about the expiration at our Terms and Conditions page.” – Nintendo email
This applies to the European program of course, but it’s still disappointing news. I know a lot of people have accumulated thousands of stars, but have been unable to purchase Wii points due to a lack of stock.