Which we are, because inequality enables advantages in grabbing pieces of various natural monopolies. Land is a prime example; real estate is a zero-sum game (the oblate spheroid we call "Earth" has a finite geographical area, and therefore so does any portion thereof), and rich people are able to play it by "investing" in real estate (read: hoarding land with the understanding that its value will increase perpetually on average due to the fixed supply and population-scaled demand). This is inherently exploitative of anyone lacking such an ability, and inherently results in the transfer of wealth from the working class to the ownership class - both directly (via rent) and indirectly (via opportunity costs).