Although I get your concerns, I think you maybe over thinking/worrying about it. Looking at ads is great but you have to go and view the car for yourself. Investors may well have pampered the car, less likely to have thrashed it. But you'll never really know either way, just go on condition. Also, I wouldn't go too mad over ultra low mileage cars, 20 or 30k is not that much for a 4/5 year old car. But when you do get one, get the VW all in one plan, great value for money and peace of mind.