Most markets have rallied this week on short timeframe without any basing. So might expect another downside move with consolidation before any meaningful change in trend. Possibly a time to offload investments and look to buy back in later.

I'm currently using Coinjar and they are pretty decent. I think their fees are the lowest. 1% on each transaction. You can also get a swipe card later. However they do not support all banks for deposits. Commonwealth and Westpac are fine but you can check out the full list on their website. You can deposit through wire transfer, POLi pay and Bpay. They also do not support other altcoins, so what i do is transfer my coinjar bitcoins to other trading platforms like Bittrex to trade Bitcoin to Eth for example. But anyway, i would recommend them.
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CoinJar is well known however a 1% trading fee is no longer competitive in the market. You can find better better crypto exchanges in Australia that offer fees from 0.5% This means you get more Bitcoin for your Dollars. Google Swyftx and Independent Reserve.

If you want to buy Bitcoin with cash (AUD) through an Australian exchange, you will need to provide ID in accordance with Anti-Laundering Laws. Although, if you want to completely go off the radar there are other (less popular) options. If you visit hedgewithcrypto they provide a guide on other methods available in Oz, but if you're talking about larger amounts in cash to buy BTC, then it would be difficult to find a willing seller. Good luck.

I would say no. There are much better ways to spend $3,000. If you want to stay relevant, I would suggest starting a crypto related online business such as a blog as an alternative to Bitcoin mining. It does not cost you much to run, just your time. There are plenty of ways you can monetize it once you get traffic. It is a true a passive source of income as long as it stays online and relevant. You can also be paid in Bitcoin. I've started a site writing about cryptocurrency exchange reviews in my country. In the first 3 months, it has paid all expenses and starting to ramp up. The best thing is, you learn a new skill set for free.

So long story short, the best investments in my opinion are passive online business. You control the return, ultimately. 

See a lot of people on Twitter shilling ref links, doubt they actually make any substantial profit on it, unless they are lucky. If you're an influencer with a lot of followers, it can really add up.