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I'd prefer answers to stick simply to the question itself, which to repeat, is quite simply this: "What incentives do professors have to serve on dissertation committees?"
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I have never heard of a department where staff are required to serve on dissertation committees. In some cases committee members are co-authors on the resulting papers, but this is country and field dependent. Similarly in some cases committee members get "credit" during tenure and promotion reviews. As in most things academic, it really is about the "goodness of our hearts" (or our selfish desire to be involved in research).