No one I know ever uses maths above year 10 level. What is the point of studying maths after this?

Most of us think “doing maths” means calculating answers using complicated equations. At school we do this by hand, or with the aid of a calculator. This is only one part of what mathematics is, and once we know how a calculation can be done we give it to a computer because computers are really good at doing calculations quickly and accurately.
This gives us more time to spend on the other aspects of what mathematics is: looking for new ways to use maths to solve problems and make contributions to society and economic well-being. For example, farmers and graziers are increasingly using the massive amounts of information available from the internet and satellites to help them plan long term strategies for how to produce food efficiently and economically. All of this relies on mathematics studied in senior secondary school and university.