Your statement does not back what I have read here in the US,
If what you have written here bears any resemblance to what your what your friends write in the US, you are bunch of conspiracy theorists inventing rubbish and feeding off it.
However, onto your actual claims. Regarding storage - you must have an approved gun safe. Personally, I think the law is too weak. Most of out gun crime is now committed by guns stolen from domestic gun safes. A wooden cupboard with a padlock on it is nowhere near good enough. It needs to be a real safe, bolted to the floor and lined with concrete. They aren't expensive.
Regarding ammo - you go the local hardware store and buy it. About the only restriction is you need to produce you gun licence. It must be stored securely, of course.
As for storing the things safely making them useless - you must use guns differently to how we use them in Australia. Here we take them out of storage before firing them.
The most onerous part of Australia law is being registered to own a gun. It is not hard to get registered and you certainly do not need a reason - "I want to" is good enough. There is no limit to the number of guns you can own (I know people who have 30 of them), but you do have to display a minimum competence in gun handling, you do have to prove you have safe and secure storage for it, and you do have to keep your registration up to date. It's less effort than getting a car drivers licence, and far less effort then getting a ham radio licence.
But it does involve some ongoing effort. And that is the point. That is enough to stop people who have no interest in guns whatsoever from keeping one in the draw, just waiting to be misused. For people who a genuine interest in guns like yourself the law isn't a barrier to owning a whole armory, and isn't meant to be.