It takes nothing away from this achievement, but the Supremes sold way more of their greatest hits packages. I was expecting bigger numbers before I read this post.

The Supremes had a much bigger overall cultural impact during their heyday, but I think the lackluster sales of 20 has something to do with the facts that: 1. TLC were big in an albums era (Supremes ruled in a singles era), 2. TLC ran platinum plus with each of their first three albums (so many fans already own their entire discography), and 3. the Supremes benefited from multiple format changes after they disbanded (records, then 8-tracks, then cassettes, then CDs, and now mp3s).