And, even if I'm not an owner of capital, I think it's a better system than most of the systems that have come before it.
Capitalism is the result of well-intentioned people looking at feudalism / manorialism and saying "that system is really fucked, let's see if we can improve it". And, they did. All out capitalism is horrible, but mix in some socialism and it seems to work fairly well. All out socialism has been tried and inevitably fails.
But, if we're going to do capitalism, we should really do it the way that the people who originally proposed it intended. They knew that the main benefit of capitalism was that there was competition. Without competition, it inevitably becomes winner-take-all, which just basically reverts to feudalism. For competition to work the government has to actively break up big, powerful companies, and the government has to be significantly more influential / powerful than all the businesses or people that it regulates (otherwise they'll just corrupt or ignore the regulations).
A proper capitalist system wouldn't have billionaires, because billionaires are evidence that competition has failed.