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Re:The Rule of 72 (2007) by ececconi on Thursday June 23, 2016 @12:05PM (#11962048)
At a 2% processing fee if you spend 40k a year that's already $800 in revenue for the issuing bank. I don't think that's trivial for a single person.
Re:The Rule of 72 (2007) by ikeboy on Thursday June 23, 2016 @12:14PM (#11962125)
You don't get any rewards (1% is standard, plenty already give 2% back)?

You also need to take into account the bank's cost of funds, the cost of administering the account, the cost of fraud, cost of disputes (do you ever do a chargeback?)

Re:The Rule of 72 (2007) by ececconi on Thursday June 23, 2016 @01:03PM (#11962566)
I thought the cash equivalent of the rewards are charged to merchants ontop of the fee? Square etc shelter that from their merchants (which partially explains their losses quarter to quarter).

The marginal cost of servicing another person when they already have a consumer base of people with debt is very small (close to zero). I'm trying to say it's still profitable, but not where they make the bulk of the revenue.

Re:The Rule of 72 (2007) by ikeboy on Thursday June 23, 2016 @01:10PM (#11962633)
Merchants pay a bit more in fees than banks give in rewards, but definitely not 2% more.
Re:The Rule of 72 (2007) by ececconi on Thursday June 23, 2016 @02:00PM (#11963090)
I think AMEX makes about 65% of its revenue on interchange fees?
Re:The Rule of 72 (2007) by ikeboy on Thursday June 23, 2016 @03:04PM (#11963582)
Amex charges higher fees (many of their cards charge the consumer directly, and their merchant fees are higher) and don't charge interest on many cards (charge cards). Their business model is different.