Been in this hobby for over 13 yrs. Tipping nowadays seems to be all over the place compared to when I started. For a legit session, personally I give $20. DIY, either $20 or $30. Standard HE, $40-$50, CBJ $80-$100, BBBJ $100-$120, CFS $120 max and if you/her are feeling adventurous (BB..) I’d be willing to pay $140, but in these parts, this service seems scarce.