I see what you are saying, but I maintain that for the majority of people, most will lose out. Unless I'm mistaken, that is exactly why manufacturers offer extended warranties - overall they make money!
The manufacturers offer extended warranty to cover their losses in offering one, it is the third parties that make money from them. That's why if you go into Currys to buy a Samsung 40" telly their extended warranty is like another £120, but Samsung direct can provide a policy for £30. Same for this VW warranty, they provide complete warranty cover for less than many third parties can sell with a raft of exclusions that VW don't have. Did you know that about 8% of the cost of your new car is swallowed up by the 3 year warranty coverage? Of course a car is far more likely to be showing niggles and component failure early on in it's life to to manufacturing defects not apparent at time of fitment, but 2% cost of the car for an additional 2 years warranty is hardly profiteering, VW will just about be covering its costs at that rate.
The trouble with a £50 component failing on a car is it'll cost £150 to repair under warranty if it's a 2 hour job to replace (VW to dealership contracted labour rates are about £50/hr. You get a £2000 gearbox failure and it's a 10 hour fix, £2500 etc. It doesn't take much to go wrong for this warranty to have paid for itself.
You don't think that most people will need an extended warranty? Maybe true on a £500 TV when they want an extra £120 for warranty extension, but on a piece of kit as complex as a car that has to perform in all climates, component failure is far more likely.
If I have clairvoyancy to tell my car will be rock-solid reliable between years 4 and 5 then fair enough it is a waste of money but I for one do not have the confidence in VW engineering (or 3rd party components more likely!) to say im 95% sure my car won't need an out of warranty repair whenit is 4 or 5 years old. What does £490 buy you as an option on your new car? Not a lot, you can't even get metallic paint for that. It does buy you a hell of a lot of peace of mind for (relative to the car's cost) very little outlay.
For me at least, my GTD will be someone else's car in 3 years time, so not a purchase I will make.