Earlier quoted context omitted.
The numbers were valuable only so long as the fuel existed. As soon as it didn't, they're no longer valuable. Each references fuel. If the fuel it references doesn't exist, then the RIN is fraudulent. It's not an optimization. It's just plain fraud. And having people buy actual fuel doesn't solve anything. The fuel could be standard diesel bought at the pump that people are claiming is biodiesel.
That's Jacquesm's point. Fraud is optimizing for metrics without regard for what the metrics correlate to.
The verification process has to be completed and has equivalent cost either way.