If you look purely at numbers I would bet that more wealth is lost through bad business decisions by successive generations and repeated lavish overspending rather than a one off financial crisis like divorce. In preserving intergenerational wealth who you marry is one small piece of the puzzle. Many of these rich kid camps you speak spend much more time trying to teach business acumen and knowledge about managing money. Though I hear they also spend time discussing how all the relationships in your life affect your bottom line.

Who you marry can be a big indicator of whether a couple will accrue wealth in a lifetime. The Millionaire Next Door by Thomas J. Stanley has some interesting insight into that.