Actually its controlled by everyone (mostly the big player or holders with large amount of Bitcoin in their arsenal) that is one of the downside that Bitcoin has because its price can be greatly affected by one big sell off. Also I don't know what you are thinking about not paying taxes while earning Bitcoin, once you have converted your Bitcoin to Fiat Currency you will spend it and the government will know. It will be inevitable for you to be charged with tax evasion in your case because they will question your earnings while not listed in your main income report. There are no loopholes to it.