Easy answers
ILS's do not pay parking fees.
extra runway length does not pay - cant put a mall in there
PEA is usually as dodgy as Perth if there is bad weather.
Stop bars - could be there when ASMGCS appears - 201?
2nd runways take up valuable retail space
red/white lights assist aviation - not car parks.
Seriously though there has been some murmurs re a CAT11/111 ILS - but whose gunna pay. makes sense being an end of the line destination.
24/06 was proposed to be extended to around 2650m about 8 years ago - plenty of disquiet from the relevant minister's electorate so it died.
Stop Bars are an excellent safety addititve and should be pursued - up to industry to apply the pressure to the owner.
2nd runway - over the Perth Airport CEO's DB
red/white lights - again safety additive - apply the burners.