Comment That dog won't bring home Huntsman's Rewards (tm)! (Score 4, Insightful) 136
"Merchants that accept one kind of Visa credit card wouldn't have to accept all Visa credit cards"
And if a vendor decides to starts picking and choosing cards that they'll accept, then rationally they're gonna pick the card that's the best deal for them. Which, by simple thermodynamics, is going to be the card that's the worst deal for the customer (or the card company, in theory, but they'll swiftly make sure THAT doesn't happen).
Pretty soon everything but a bog-standard Visa is going to be the same as a Discover card in the 1990s. Accepted next to nowhere.