Obviously if a masseur is working for a spa, a tip is totally expected and should be given (Unless the service was terrible) because the spa takes a large cut of the fee. But if the masseur is working out of their home, taking the full profit, which these days is way more than most people make an hour, usually cash, I don’t feel obligated to tip. It’s got to be completely mind blowing to give more than $160 for a massage in my opinion. If someone’s flat rate was around $100, then I’d likely throw in some extra.