How is it different to me putting all my money into a Paypal account?
Bitcoin isn't regulated in the same way i.e. know your customer regulation doesn't apply in general so you can do it relatively discreetly and without too much hassle if that's what you need , paypal is fairly subject to whatever the US wants it to do and will bend over backwards to comply with US law wherever you can do whatever you want with bitcoin
How is it better than minting my own Gold coins?
If you think of any currency as being worthless unless people use it then that's your answer i.e. brixton pound is relatively worthless compared to the US dollar because of the people who use and support the currency by using and trading in it are much more with the $ , so if you mint your own coins their worthless until people actually want to use them as a currency whereas bitcoin has a user base and worthwhile value
Bitcoin isn't regulated in the same way i.e. know your customer regulation doesn't apply in general so you can do it relatively discreetly and without too much hassle if that's what you need , paypal is fairly subject to whatever the US wants it to do and will bend over backwards to comply with US law wherever you can do whatever you want with bitcoin
If you think of any currency as being worthless unless people use it then that's your answer i.e. brixton pound is relatively worthless compared to the US dollar because of the people who use and support the currency by using and trading in it are much more with the $ , so if you mint your own coins their worthless until people actually want to use them as a currency whereas bitcoin has a user base and worthwhile value