Great idea, and would decimate the costs of court hire. You'd pay 1 set-up fee per 2 games, plus a couple of extra hours. Any live-to-air would have to exclude one of the games unfortunately, and that would more than likely be the women (sorry, but true).
Maybe the ABC, with their focus on women's sport will continue showing WNBL. Then both could be live, one after the other. Just like at the stadium but without having to change stadia, just channels, ABC for the WNBL then straight over to 10(?) for the NBL. Over 2 channels it could work. Fans can watch either/both and neither channel has to change much.
And the fan base for both would increase as NBL fans are exposed to the WNBL and visa-versa.
Stadia would always look/be full which they say, improves the televised product.
Attending fans may even get better value. You could not double the entry fee but you could up it some.
What's the cost of the cheapest seats, generally? Around $30? Fans turning up for the WNBL game pay half more, $45 and get to watch both. During the 4th q, prices go back to the norm for 1 game, $30.
Don't know what you would charge those who only wanted to watch the women's game. Maybe the 1-game fee ($30) and then have them all seated in one area. Soon as the women's game is over, that area is cleared out to allow for those attending the men's game only.
The club gains too. Those seats, if filled for both games earn you more, $60 instead of $45. And as there is only 1 set-up fee included for the double-headers, the seats will actually cost less.
That last bit is messy, isn't it? The rest isn't.