It's because earn rates haven't been reviewed for what at least 10 years? Airfares do change frequently and we also had a pandemic. The earn/burn structure of the programme means that the programme is being devalued constantly as inflation occurs as you are earning less and less compared to the amount you pay and also need more points to redeem the same increasing fare. Other distance based and true revenue based programmes don't have this problem. I have long said that those who praise the "simplicity" of the programme are being fooled.