I made that conclusion based on the fact that CHMJ has a high cume compared to many other stations in the market but yet a low overall share (including CHMJ's news/talk sister station, CKNW, which has a 7.8% greater share percentage). If you were only to look at the share percentage, you wouldn't get the full projection of who listens. I'm sure the situation is similar with KOMO (but all we get to see is the market share).
I could very well be wrong; you know ratings well while I do not, but there are some hard figures for you. Hey come on, I tried!