Why do honorary consuls work for free?

Honorary consuls are local personalities who represent foreign states in Switzerland, and they are not paid for their work. What motivates them? (RTS/swissinfo.chexteal link)

There are about 130 honorary consuls them in Switzerland. They are not professional diplomats, but people who work on a voluntary basis until their appointments are revoked. For instance, François de Coulonexteal link, who owns the château of Eclépens in the canton of Vaud and a large wine estate, is also an honorary consulexteal link for Slovakia.

Jean-Marc Probst is the director of a businessexteal link that sells machines for the building industry. He is also honorary consulexteal link for Germany in cantons Geneva, Valais and Vaud. His consulate provides passports and official documents for the 16'000 Germans in the region.

Michel Sogny is a pianist, composer and doctor of philosophy who developed a new approachexteal link to teaching the piano. He has his own foundation, SOS Talents, which was created to support gifted young pianists. Sogny is also the honorary consul exteal linkof the Republic of Lithuania in the cantons of Geneva and Vaud. He accepted the post because he wanted to contribute to the cultural cooperation between Lithuania and Switzerland.