You can't say: "I need some money, so I will produce a briliant idea now." Revolutionary ideas just happen. But most inventions need a lot of work and research done. For instance, where would you find thousands of people to do some boring laboratory work to invent a new drug? Where would you even find people to produce laboratory equipment, to start research in the first place. And where would you find people to dig raw materials from the ground to use them to make the equipment?

We can't just sit around and wait for a great mastermind to be born every 100 years to invent a few things. We have to force as much people as possible to be productive and work on the things that benefit others.