Credit card issuers (banks) cover their costs (including the interest costs for the money that is paid to merchants prior to the bank being paid by customers), and earn profits, by:

Domaining is the business of buying, selling, developing and monetizing Internet domain names. Such domain name portfolios often include cleverly chosen and highly marketable generic domain names, or domains whose registrations had lapsed yet still retain reasonable traffic. There is sometimes no actual intent to use any of the domain names with the exception of generating advertising revenue through domain parking.