If you go to a restaurant, barber or ask someone to carry your bags, you should expect to tip.Restaurants, barbers, and baggage handlers for me. I don't use the latter as I am capable of handling my own. I think tip jars at every business is ridiculous.
I did valet parking. You better tip me after I just ran and got your car. Especially when Valet parking at the Hotel I worked at was FREE.
One time I unloaded 3 tour busses of Asian people's luggage. Do you know how many trips I took up and down? Not one of those cheap fuckers tipped me. So my manager put $3 on each room for my tip.