The relationship between time and money influences to a great degree most decisions that are made in the modern world, and, perhaps, even those of the past few centuries.
Consider even the writing of literature. Charles Dickens, for example, was renowned for sending out his novels in installments. He would write, have that piece published, get paid for it, and then work on the next chapters, all the while creating interest in the series by ending the various installments with intriguing cliffhangers, drawing his crowd in for more. And, money notwithstanding, time alone allows for the possibility of greatness; James Joyce's "Finnegans Wake" took 17 years to complete (though the greatness of this book could just as easily be assigned to Joyce's genius). Money and time created both.
I don't suspect that this changes with golf course design. More money from investors affords designers more time and, therefore, more freedom to create a product that (with some argument) is of higher quality. There are schedules, to be sure, but money and time help to allow for changes to be made when necessary.
But more than this, I think it is that we are a selfish people, particularly here in America. We want our greatness to be almost unattainable. Further, with the bulk of the courses that we consider great, from the early, Golden Age designs to the present (and with some notable exceptions), developers and investors are simply willing to spend more money and time on private clubs, because they are ultimately reflections of themselves and, often, their business savvy. Again, this extends from the autocratic nature of MacDonald, Crump, and Fownes, to the New York Athletic Club demanding a "Man-sized" course from Tillinghast, and even through the Wynn/Fazio experiment in alchemy in the Las Vegas desert.