Avalon has Geelong! Less than 30 minutes away.
Yes it does. But I think the number of people in Melbourne Metropolitan Area that are close to AVV than to MEL, is very small due to the relative location of the two airports (one SW of Melbourne, the other NW). It's only a few suburbs in the City of Wyndham (Werribee, Point Cook, Wyndham Vale, part of Hoppers Crossing) that are closer to AVV. Probably 300K in Geelong/Surf Coast/Bellarine and another 100K or so in the City of Wyndham. For Western Sydney it's over million. An equivalent location for WSI in Melbourne would be somewhere out Pakenham/Cranbourne way - the opposite side of the city to MEL.