Well - I carry 3, and would carry 7 if I wasn't trying to slim down my wallet.

Those 3 are:

* An personal AMEX cashback card, that gives me a very nice 5% back in certain categories, and 1% back on everything else.

* A Visa Airline miles card, for places that don't take AMEX or travel spending where I earn 2x or more miles.

* A business Visa credit card for the business my wife owns.

The other cards I'd carry if I wasn't annoyed by a thick wallet are:

* A Costco AMEX that gives me extra cashback at Costco.

* A couple store-specific Visa cards that give me nice benefits at stores where I shop at least semi-regularly.

* A work credit card for my work.

I'm a bit of a miles/cashback junkie, but I'll bet many people have at least a few cards they'd like to consolodate. The average American family has 8.

Like I said in another comment, I'd be thrilled if I could replace all those with one card, and I'd be happy to pay what Plastc is asking if it worked. But the most likely scenario I see for that happening is mobile payments a'la ApplePay.

>> Do you know many people that use more than 3 cards regularly?

It's not so much about use as it is about carry. I may use only 3 cards regularly, but I carry 13 in my wallet. Most of the lesser used cards are ID I have little choice but to carry or loyalty cards for places where I shop.

_IF_ the claims about chip and pin capability are true, I'd be able to pull out at least half of the cards in my wallet, which would be a significant amount of bulk.

If it were just credit/debit cards, I'd agree with you, but this purports to support gift cards. I've had too many gift cards to carry around, and ended up not using them because when I was actually in the store they were at home. So I do think it does solve a problem. That said, the problem this solves isn't important enough to justify the price tag (for me).

It claims to support RFID, so I wouldn't have to carry my work door card. I'd strongly consider that.

Korea