I think we are seeing a change in demographic that changes the demand for certain marques.
I have been told its a stereotype for Indian people to want to buy Toyotos and particularly Corollas. I don't know how true this is but it was an Indian guy that told me this.
As for Mercedes, there are a lot of people that value the image that their car sells for them. I have heard stories of people buying these upmarket cars and only just being able to afford them, but to them its important.
Me, I am quite happy with the car that is old, reliable, nothing flash, a bit overweight, and struggles to walk up stairs... I might be blending my own characteristics there a bit instead of the cars.
.. but this is all probably affecting the value of the Holden and Ford brands. People here seem to have a negative view of those brands thinking that they are only 'taxis' and instead feel like they want to buy something European or Japanese to better reflect their individuality, like everyone else?
Perhaps in 10 years the GM and Ford brands will be better viewed as the stigma of being taxis is forgotten about and when 15 year old Mercs are commonly found on the side of the road after the imported radiator dies a sudden death or the person on welfare cannot afford the $500 to visit a Merc dealership to diagnose that his car needs a new fuel pump?
Personally I find it very unfair when people compare these sorts of things. A 10 year old Falcon will be cheap to maintain and run, but I am not sure I could say the same for European brands. I particularly get annoyed when people point out Commodores from the nineties that have broken down on the side of the road, and don't stop to think why there are no European cars from the 90s on the side of the road, most likely because they haven't lived that long.