I think no need to pay taxes for profits. I thought that taxes are for companies, employers and employees only who earns wages and salaries. In the world of crypto, you do earn only profits for your hardwork in joining bounties and buying from ICOs.
I completely agree, there's no need to pay your money to some strangers. Moreover, the market makes us incur losses (very serious sometimes) even without paying taxes. If we also start to pay taxes, there will be no sense in dealing with cryptocurrencies.