Without being totally cynical, to play Pat's role...
Pat,
1) How many of these men did you know personally, those that died broke?
2) How many of their personal financial records have you seen?
3) Do you know for a fact what their business models were?
4) Given that MacKenzie, Tillinghast, Ross, Flynn, MacDonald, Raynor, etc. produced more great courses than most modern architects - with all due respect to Doak, C&C, Dye, etc. - it is hard to find fault in their business models and, thus, resumes. Obviously, our modern favorites will produce more great courses still but...it is not a given that their legacy will be greater that the Golden Age Designers, better business model or not.