That is true. Life's unfair, I guess. And stonecold raised a very good point, that is just like saying you are good at physics or something just because your parents happen to be Albert Einstein. Its not the fact that your parents are smart that automatically makes you smart, its the fact that they have a good learning environment and they are exposed to those sorts of things more. They put in the hardwork as well. The only disadvantage is that you won't be able to have as much exposure as people in that or likewise situations.
But I personally don't solely agree with the fact that scaling over 50 is unfair. VCAA do it by normal distribution. If it is an extremely hard subject, such as Latin, it is only fair if they give that much more advantage to that of a 50 in further maths (not saying this is a easy subject but it is definitely less difficult than that of Latin - I know this is debatable, but this is believed by a vast majority of public discourse). But I understand the fact that some subjects are not offered at certain schools, and some people get that advantage because they are good at languages, etc. etc., but to propose as system that is 100% fair to everyone is just impossible. If we drag Latin's scaling from 55 to 50, there would be opposing sentiments. If we leave it there, similarly, other would disagree.