Earlier this week, the Wall Street Journal reported that merchants like Home Depot, Target, and Amazon are becoming increasingly frustrated with the high fees they pay to accept rewards credit cards, and are seeking relief from the courts or through negotiations with Visa and Mastercard. Particularly, merchants are looking for the networks Visa and Mastercard to end their ‘honor all cards’ rules, which say that if you accept any Visa credit card you need to accept all Visa credit cards, and ditto with Mastercard. Today, if you spend $100 at a large grocery store, Visa would charge the store a $2.20 processing fee if you used a top-tier rewards credit…