When I booked people to move my belongings to my new house, I picked a company where all of the employees were full-time salaried employees making a decent wage

When I booked people to move my belongings to my new house, I picked a company where all of the employees were full-time salaried employees making a decent wage and had relative security in their jobs along with PTO, pensions, etc. When they finished, they still asked for a tip. I said no because I paid a premium them for the very reason that I didn't expect that they'd ask for a tip.