Such a card exists! Well, at least it used to. I applied for my first credit card in 1994. An Apple Citbank Visa. It offered 5% earnings on all purchases up to $500 per year, if I remember correctly.
The earnings we "banked" into an account that was redeemable for any Apple product. It was a high interest card - but if you were like me and paid off your card every month, you could make a pretty sweet lump of cash every year to put towards an Apple something-or-other.
I used the card for about 3 years and put $1500 down on a PowerMac 7500/100. The Apple Card program was cancelled shortly afterward. I had a small remaining balance and bought a Geo-port with it.
I still have the credit card account. It is still the only card I have. And while I no longer get the Apple redeemable bonus with the card, I still have fond memories of being a college kid and getting a seemingly free computer just for buying groceries and paying rent.
PS: I still have the 7500/100. The Geo-port went into the trash a long time ago.
I Want An Apple Credit Card