It should be %0. Why would I pay a tax for the risky investment I made and earn money? I am taking all the risks and must I share the profitwith the government? Of course not. It is contrary to the Bitcoin and crypto currency philosophy.
I agree, they don`t share risk with us, so why would we share profit with them? Very logical, but governments don`t care about it. Like they taxed everything they will find a way to tax cryptocurrencies. I didn`t vote cause I think it will be proportional, if you make profit up to 10.000$ it will be 10% if you make up to 100.000$ it will be 20%, for millions of dollars in profit it can be 30% or more, that is how they do it in many countries in recent decades.
I agree with you, tax is contrary to the bitcoin and cryptocurrency philosophy but it is what it is, who doesn`t wish to pay it can turn to coins that offer more privacy and to try to skip paying tax like that.