justahalf - stand corrected on the RE stuff, but as for the main benefit of going private being the old boys network...I disagree, I'd actually say the main benefit is the extra resources available to students, the fact that the teachers are dedicated, driven, and better paid than their public counterparts, and also that the nature of education/discipline (absolute zero tolerance policy on drugs, harassment etc, and the fact that the teachers go out of their way to push and motivate students) at private schools tends to give their pupils the edge.
However, as Cyber_Princess pointed out, there are some snobby gits (had that problem too, coming from Red Hill)
Private schools are essentially the product of capitalism applied to the education system. If someone wants that type of education for their kids, they pay for it - and the number of people on the waitlists for schools like Kings shows that people *are* willing to pay, for whatever reasons. As for it being morally right or wrong...morality rarely counts for anything in a capitalist system.
As for phil's point...RobW was actually saying that if you own a house there, Grammar can't stop you from attending. As for not being able to buy a house in Grammar zone - again, demand outstrips supply, for whatever reason. Lots of people want Ferraris, but can't afford them, because demand exceeds supply, and the price is high as a result - as long as the state can supply a good education, private schools are an option, and should be available. If the state can't...well, that's not the private school's fault, it's more a case of where exactly the Government is spending its income - Rob's example of $30 million going to sports like yachting is a case in point...