They actually don't believe in capitalism and profit, because if they did, they'd recognize that extreme concentration of wealth is actually detrimental to capitalism (the system's) performance. Ricardo, Mill, and Smith all saw this dynamic, but "capitalists" like Andreessen have shown zero interest in combatting it for the health of the capitalist system as a whole.
They also wouldn't, for example, try to use government to prevent the market from building housing near their mansions: https://therealdeal.com/san-francisco/2022/08/08/marc-andree...
You're ascribing way, way too much intellectual consistency to these people. They have no moral system.