I really can't believe Amex lost the Costco account. This annoys me in two ways:
(1) I already have a Visa card that I like and it is not through Citi. I once had a Citi Visa card and I hated it! The customer service was awful on so many levels.
(2) The only reason I had Amex was because of Costco but it became my family's primary card because the rewards were so good.
http://finance.yahoo.com/news/costco-strikes-deal-visa-citigroup-133512058.html