Medibank will be increasing insurance premiums by 4.6% from April 1st.
See link: https://www.medibank.com.au/content/about/media-centre/2017/…
If you have the spare cash earning 3% (really ~2% after tax) in a savings account, you're better off prepaying the maximum 12 months to avoid the increase effectively earning 4.6% tax free.
Other funds are doing this also - marketing ploy to be honest. Time to shop around.
Here is HIF trying to justify it also
http://www.hif.com.au/health-insurance/information/2017-prem…