I paid United/EVA Airlines $100 for each of our 3rd checked bags from Phoenix to Bangkok. Air Asia charged me $300+ to check the same 3 bags from BKK to CNX. I was flying with my two children (all of us had a 3rd checked bag) and the total was just under $1K USD. I’m sure that Kerry would be a much better deal.
It might have something to do with your age. I’m 75 and my card is good for the rest of my life. They might be thinking that I won’t be around in another 10 years.