I don't disagree that rational citizen actors are making themselves more money in those specific scenarios. But that doesn't mean capitalism is increasing the nation's net capital and wealth in any way communism could not have. It doesn't mean those actors are not increasing wealth inequality (some could be, maybe it's negligible, maybe it's even decreasing). Fixing one's own microeconomics isn't equivalent to fixing the entire nation's macroeconomics. If the nation has a small total value, it's not going to increase total value size if you yourself take a bigger peice of the pie.