Mostly they no longer were the near monopoly and CN was not aired as widely. It is harder to sell a whole station then a few shows. WB tended to sell separately

Mostly they no longer were the near monopoly and CN was not aired as widely. It is harder to sell a whole station then a few shows. WB tended to sell separately their own only. (E.g. Bugs, Daffy, Looney Tunes) HB ones were exclusives.