Until pricing in the US exceeds the rest of the developed world, you won't convince me of this. After all, we are among the top countries that use credit cards.
Do you have examples of things bought with credit cards that are cheaper in the US compared to, say, the EU? Even having in mind that most European countries have a ~20% VAT on many products, while US sales taxes are usually lower (less than ~15% IIRC), in my personal experience the US is more expensive for most everyday consumer goods even than France.
