This has been discussed on several occasions previously as ASF. The summary of those discussions are pretty much as follows:
If the stock is owned anyway as part of an existing portfolio, then selling far OTM calls can be a good way to bring in a little extra income. Of course, the sold calls can cap the upside in a fast move and, if assigned, could incur capital gains tax depending whether trader or investor status with the ATO. There is no further downside risk on the stock than the risk already assumed when holding the stock in the portfolio.
However, if the stock has been purchased specifically for the purpose of writing calls, it becomes a whole different animal. The downside risk of the stock needs to be carefully weighed. Even more so if this strategy is set up using margin loans.