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Also keep in mind that even if people put a panel on their mysched it doesn't always mean they will attend. I personally put my plan a, b, and c panels all on there so I can look at a glance.
I agree. It's terrible for actual numbers - I use it to mark anything I'm interested in as well, which is sometimes as many as three conflicting panels - and I'm sure lots of people just don't use it at all. But enough people use it that you can at least get an idea of how popular something is in relation to other panels at the same time.
I know John Barrowman is popular, but Top 10??? The last few years IIRC he was in the 20s-30s.