The reason why many people like commodores and falcons is because:
1. They are easy to live with (family car, cheap parts, great for long drives around the country)
2. Have above average performance (a stock V6 Commo/6cyl Falcon beats most non sports cars at the lights)
3. Very easily modified to get low times.
4. Loads of room for big guys like me 6'4+
If you have a look at most HSV/FPV buyers, they are men in their late 20s/early or late 30s and 40s. These guys have the dosh. They also have a big family...
The funny thing is if you have ever went to a Holden site like ls1.com.au then youll notice some of those guys own cars such as:
SS ute, SS sedan and maybe even a third car as an HSV... its like they stick to their own brand.
I like Holdens (been driving a commodore for most of my driving years (18-25 yo)) but I recently decided to get an import... only owned it for 2 weeks now but the Skyline blowed me away... the build quality and go of this car is great... I cant really compare the VS 95 model to this 96 model R33... its maybe fair to say that the VS was an ex Telstra car and wasnt treated with love like this R33 was, but electronically wise the Skyline still outmatches the Commodore.
Would I buy another Holden in the future or stick to Skylines/imports? Yes I would but my next car on the cards is a well looked after R34 GTT coupe... however I would not hesitate to buy a newish VX+ Commodore to do everyday shopping in as well as going for a long drive or taking my dog for a drive.
PS as others said Skylines are also family cars, just for smaller people and commodores/falcons will always fit guys like in them... ever tried sitting in a silvia or even skyline with a sunroof when ur 6'4? lol