1. Incorrect. UK, US and many other tax authorities are clamping down and you WILL be required to pay taxes. Stop spreading false information.
2. You haven't made any money until you turn your bitcoins back into local fiat currency.
We will have to agree to disagree. The vast vast percentage of the world pay zero taxes. Think billions of people in India, Africa, South East Asia, Latin America. Think of a bitcoin as gold. Are you paying taxes on any increases in the value of your gold? Of the hundreds of bitcoin owners I know, not one has paid taxes.
What is more likely though is that you get asked to pay tax when receiving a bitcoin as income (in this regard just as you would have to pay taxes if you were paid in cash or gold). But in reality if transferred peer to peer what you were paid and from whom etc is anonymous.
In terms of turning btc back into currency (or using btc to purchase goods or services, this can be done at anytime, anywhere, instantly and in any denomination and into any currency).