When cars get to a certain age it is condition, condition, condition.
I didn't drive mine for about 6 weeks while it was up for sale, got in and took it for a spin to get its juices flowing before someone popped round to see her, the car felt stiff, creaky, a lot like me when I get woken up too early.
After an hour of driving some of my favorite local roads the car started to respond better, become more 'supple'.
IMO any performance car needs to be driven and regularly to be kept optimised - a 40k car has averaged what, 6-7k miles a year, I'd say that was the minimum to keep a car healthy including servicing on the button.
It cannot be good for these cars to do <3-4k miles a year - all that time sitting, fluids doing nothing, lubrication dripping away, rubbers perishing, fuel going off and moisture build up - give me a driven car any day.
...and... a 30/40/50k car is an honest one, let's not think for a second that some of these low milers haven't had a haircut at some stage in their lives, it happens.
If you want to buy a (great) GS today it's going to cost £30k or more, there's what, less than 10 for sale in the whole of the UK?