Tangentially related, for similar reasons Paypal remains my payment processor. Lots of people have Paypal accounts and find it much more convenient to use it rather than haul out their credit card and hand key all of their address and payment info. Every time I think about switching I review how many people use PayPal Express checkout rather than credit card DirectPay (both of which I offer), and I think about how many people simply wouldn't pay if the minimal friction of the PayPal Express button wasn't there on my checkout form.

Lowest friction wins.