It's also not very easy for them to just change payment processors either. Most company don't store credit card numbers. They get a token from the processor that is stored in case they ever get compromised, so switching a provider would removed all the "saved" credit cards on peoples' accounts.

(I never save cards anywhere. I literally retype my number ever time. Great way to buy less and think about if you really want something. Only Etsy doesn't allow you to, so you have to go into your account and delete the card every time. I fucking hate Etsy).