Shep!
That's some cool data. I'd love to see what the profit spreadsheet looked like for these titles too, since per your example, in 1968 when OFF was over 50% the talent pool was Kubert, Grandenetti, Andru/Espo, Heath, Novick...by the end the % sold might have been lower but that was when the artists in the Phillipines were being paid a lot less. By the end the only big names left were Kubert on the covers and Glanzman on some of the interiors. Everything else was overseas talent or Kubert School students. I'm betting they were still making good bank on them at cancellation, just not AS GOOD as the long underwear titles. It's a shame; like you said, those numbers would be very impressive today.