For something as fungible as credit card transactions, it's hard to understand how a "brand" could be truly valuable. (Or is the grocery store cashier secretly really impressed when I produce my Amex Blue?)
I've live in New York and I've literally never been to a single bar or grocery store that accepts American Express. Anyone know why this is?
With some processors, there's also a monthly fee if you take any AMEX, so it's better to not take it all.