The complying investment framework is designed to maximise the benefit of investments for the Australian economy, not to ensure visa holders get a return on their investments. The department does not get involved with your investment decisions and cannot guarantee any return on your complying investment.
Investing in complying investments can be risky. You could get back less money than you put in. You could also lose all your money. You could be locked into a contract that lasts longer than the term of your provisional visa. You should always get professional legal and financial advice before you invest.