I'm sure they've thought about it. However, as others have found, getting through the amount of fraud out there with a margin less than the ~3% that credit card companies charge, is really hard. I mean if you were perfect that would be 3% profit. If your uncaught fraud rate is even a few percent higher than that of companies who have been doing this for a long time, you will be bleeding money.
Again, I'm sure they've thought of it, but the credit card companies are actually pretty good at a very hard task, which is enabling super-easy and quick payment verification without getting eaten alive by fraud.
Again, I'm sure they've thought of it, but the credit card companies are actually pretty good at a very hard task, which is enabling super-easy and quick payment verification without getting eaten alive by fraud.