Whatever she wrote was a critical success and also sold well. But the money wasn't enough to cover the heavy expenses of her Mogoșoaia project (where the pavement of the Grand Hall is covered with gold), so she began writing popular romances under the pseudonym Lucile Décaux, and articles for fashion magazines under her own name. She had a long-term contract with "The Saturday Evening Post" and "Paris-Soir". In the 1920s and the 1930s, Mogoșoaia Palace was to become "the second League of Nations", as the French Minister of Foreign Affairs, Louis Barthou, put it. There, annually, Marthe hosted royalty (among others, Gustav V of Sweden and the Queen of Greece), aristocracy (princes Faucigny-Lucinge, Princes de Ligne, the Churchills, the Cahen d'Anvers), politicians and ministers, diplomats and writers (Paul Morand, Antoine de Saint-Exupéry).