My brother's father in law said the best thing he learned in West Point was, "If you have a right to complain, you have a duty to praise." In the last 40 years, since I heard him say this, I have made a point of giving that praise in a concrete form. Sometimes it was just a letter of appreciation. Most of the time, I hear that no one had ever shown appreciation for that person's work before.
I sent a large bouquet of flowers to the secretary of my department who took her lunch time to chase my Master's Degree paperwork around so I would not have to travel 200 miles to do it. The head of the department later told me that he was ashamed that HE had never given her her due praise. I am not rich or powerful, but I can say thank you.