It may be easier to understand if I pose another question. What is meant by "The business of that business is house cleaning."? In this sentence, the first "business" means what types of products or services are offered by an entity. The second "business" refers to the particular entity (company, partnership, sole proprietorship, etc.) that is offering the services or products. So, my sentence can be shortened to mean "That business offers house cleaning." Your sentence is a bit of a play on words. It means "That business exists to carryout whatever business it thinks will make money." or just "That business exists to make money.". The speaker believes that entity will do whatever it takes to make a profit.