RIAA Certification

[BigBigLove]

The independent audit required to gain RIAA certification/recertification for an album has to be paid for by the label -- this can sometimes cost many thousands of dollars. If an artist isn't actively promoting a release at that time, the minimal additional press exposure for the certification may not be deemed a worthy expense by the label, which is probably why you haven't seen Rumours get recertified (and why Landslide hasn't been certified, etc.).