The difference is that Perth just has more footy fans.
I know it has more footy fans, but those footy fans also already have options.
Canberra is a captive market for its footy fans.
According to the below post you have 49% penetration in the population divided three ways. Lets assume the new team marginally increases overall AFL support from 49% to halfway to getting to Melbourne/Adelaide support of 56%, so split the difference and go 52%.
In 2050, Greater Perth's population is 3.5 million so 1.82 million footy fans. If by 2050 the new team gets 20% (say) of that support that's 360,000 supporters.
Greater Canberra's population will be something like 750,000 in 2050.
The ABS page I'm looking at that has Canberra at ~750k for the medium range also has Perth at 2.95m.
And while Canberans are richer, they still have to have a product to buy to get the big membership dollars. There's less corporate facilities to sell, and the total number of truly rich individuals in absolute terms (not relative terms) is lower.
Fair point on the corporate boxes, but I would say we have enough contracting companies vying for the government dollar to fill that hole.
Canberra and WA3 are both obvious candidates for Team 20 but like my earlier post the barriers to WA3 is not if there's enough footy support (there is) or if it adds up that they can play games and sell memberships in the stadium (they can) but the effectiveness of branding and geographic positioning to successfully siphon off WCE supporters (give people a reason to support the team) and WAFC politics. But the raw city of Perth numbers stack up more than Canberra.
Long-term, I absolutely think WA3 can be successful. But I don't see it as the immediate easy option as it's often touted.