in general, "wealth" as we tend to discuss is created generationally. One person makes a small fortune and passes it along to children who then use that money create more wealth which is then passed down to the next generation and so forth.
You say that wealth tends to, by nature, be exclusionary. I disagree. Wealth is not exclusionary. At least in the US. The biggest obstacle to generating wealth is the current Democratically led idea of estate taxes. Federal estate tax rate is 40% and states vary but I believe about 20% is the highest rate. Most estates will fall beneath the exclusion but that exclusion cap ($5M federal) is a huge limiting factor on the generational accumulation of wealth.
Too many people equate high incomes with wealth and the two don't necessarily go hand in hand. With a few obvious exceptions (Gates, Zuckerberg, etc) most wealth is created generational accumulation.