Would you switch payment processing companies if they offered you lower rates?

Method of payment? I think you may have a merchant account confused with something else. Merchant accounts are not a method of payment. You know when you visit an online store such a amazon.com or a local retail store and you pay using your credit or debit card. The service that allows amazon.com to accept and process cards directly from their shopping cart, and the service that allow a local merchant to accept payment at the register is facilitated by merchant account services.