Because the policitians consider it as their property, while Mobutu built it for the people. Back in the days rich people were holding their weddings, musicians giving their concerts, actors and comedians giving their shows, etc. In 1997 LD Kabila decided to bring the National Assembly and Senate, who were first at Palais de la Nation to Palais du Peuple, but it wasn't a problem for concerts, shows, etc. With shortly after that a trend starting of bandleaders and gospel-singer to perform at l'Esplanade de Palais du Peuple, where first Etienne Tshikedi and the pope used to give speeches to a big crowd. But from 2003 when the 1+4 governement came they started to refuse. From then they only accept to expose bodies of politicians, sportmen, big musicians there, like they did with Madilu, Tabu Ley, Emeneya and Papa Wemba, but concerts or shows no. Comedians were every time crying on tv about that, but Showbuzz solved that problem. Even just filming there is a big problem.