Not just some average businessmen, but quite the Internationale of mostly big steel and defence co's (Thyssen, Comité des Forges, Vickers, Dutch Shell etc.) paid abt 50M Reichsmark for his 1932 campaign, when rally hopping by plane all over the country became a thing.
Don't forget all the American businesses that had investments in Nazi Germany, or businessmen who boosted Nazism at home, like Henry Ford. Ford was one of Hitler's heroes, admired for his business savy and for his staunch antisemitism.
