I certainly wouldn't advocate tax evasion, it would be immoral to ask people to risk the leftovers of their freedom and confront IRS. What I meant was, don't give them a cut unless your transactins can be effectively tracked. When you tip someone in cash, most likely they're not paying any taxes from that. And there's currently no law requiring you to pay taxes in Bitcoin unless you previously converted it to fiat. Also keeping your savings in gold, silver or Bitcoin saves them from another tax - inflation.