CustardCake, quite often the people that do move closer to the school to guarantee a place are those who started out on the fringes themselves. Or they live just outside the catchment boundary. Either way, they are still fighting for a place in their local school. If not, certainly of their local schools.
I maintain that it is not stealing. Stealing involves taking something that is already owned by a person. When it comes to school places, every child will get given a school place somewhere, so the child that has been 'stolen' from will still end up with a school place, and the place that may have come to be theirs, was never something that belonged to them. Children are allocated places all at the same time, they don't get given them only to have them 'stolen' away by someone that has moved closer to the school.
Every year it's about the luck of the drew of those children that live on the outskirts of a catchment to a good school. Some years they would get a place, some years they wouldn't, regardless of anyone deliberately cheating the system.
Lurkers, while I agree with the sentiment of your post, I disagree that all well supported children will do well. And I disagree that the Holy Grail is good teachers. I think it's down to good parenting. A good teacher that is up against an unsupported child who has parents with a bad attitude towards parenting has a much much harder job to do. No matter how passionate s/he is about the job.
A well supported child might be ok wherever they go, but what if they are clever and not very well supported because as much as the family want to be supportive, they have another disabled family member to consider. The well supported child could be bullied into being miserable at school and therefore not doing as well as they could have done. A well supported but easily led child could flourish in an environmemt where all the children want to achieve, but put them in a school where a large number of the children aren't bothered about their education because of their parent's attitude, and they could start to have that bad attitude rub off on them.
And it's not about just doing ok. It about achieveing maximum potential. All schools should be able to provide this, but the fact remains that they don't. Bad teaching is a factor, but bad parenting is a bigger one.
That is why people do this. I think some of my reasons above, do justify cheating the system personally. You only get one chance with your child's education, and it does matter where they go to school, even if they are well supported.