Ultimately you're there for a massage, and paying for a massage. If you start hinting towards something more than that then its fair game for them to mention they're price. You can take it or leave it. They're not there to build your self esteem and make you feel wanted. You can hire a skilled escort for that. You can't expect them to leave it up to you to "tip" an amount at your discretion especially in a $70/hr place in which they get a third of. My 2 cents.