
I would have to say for a well bred pup from health tested parents £600 is about right. It costs a lot to rear a litter, I find about £1600 or more if there is no out of the ordinary vet expenses such as a C section or problems after whelping out of hours. This is without taking into account the breeders time and efforts and extra fuel and other unquantifiable costs like extra phone calls.
Any pups for much less than this will have had corners cut on their rearing (cheap poor quality food) and will almost certainly not be from parents with full health testing, which for Labs would be hip scoring (my last one 3 years ago cost £170) Elbow Scoring (probably same cost as Hips) and annual eye testing (about 25 plus petrol to go to specialist).
Think about it the latest games consoles, mobile phones, TV's etc are pretty expensive.
Good Pups have usually cost in line with about a months salary, so £600 is not excessive.
Just because you are not going to show does not mean you should not expect to have the most typical pup from excellently planned matings. Show dogs only show at most 50 times a year most not half that, so for some 350 days a year they too are pets. With a pup from a litter bred to the highest standards of health temperament and matching conformity to breed standard will give you the best chance of having a dog suitable for a pet.
Showing requires a dog that is friendly confident, happy in all manner of situations from travelling to crowds, hotels railway stations, which requires a rock steady nature, and a dog that is a cripple will not be able to win either.
I haven't mentioned the Working side as many people might find a working bred dog a bit much dog to start with,a s they will have sharpened working drives, and need much more training and exercise to be a happy companion compared to their more laid back show brethren.