to Fly:
Right. but closing accounts more often than not, reduces your credit score because you've reduced your ability use credit. When that happens, other lenders see that happen on your credit report & then raise their interest rate, lower their limit and/or close your account because suddenly you look like a higher risk. And then, the customers that have been making their pmnts on time every month - using their credit cards - now can't. They lose the ability to pay off this months utility bill, gasoline expense, etc off next month because out of nowhere, their account or credit limit was cut off.
Further, to those who carry balances and pay on time, a random increase in interest rate (just because they can) means suddenly more $$ out the door with zero additional gain.