Correct. North would make $180k, Doggies $40k, Blues $10k if they're the home team with a 42,000 crowd. North actually has a pretty good deal, if their members bothered to show up.
Isn't it because their members don't show up (partly because their membership base is smaller), a 42k crowd at a Roos game includes a far higher proportion of gate sales? Hence why their net return would be higher.
Given the Blues make a lot more from memberships, to suggest North would be better off with a 42k crowd as well is highly misleading.
The Dogs were just sucked into signing a guaranteed return contract, which in business will always restrict your potential return because it reduces the risk.