By "pure Bayesianism", I meant the attitude expressed in Chapter 13 of Jaynes, near the end in the section entitled "Comments" and particularly the subsection at the very end entitled "Another dimension?". A pure "Jaynes Bayesian" seeks the truth, not because it is useful, but rather because it is truth.

By contrast, we might consider a "de Finetti Bayesian" who seeks the truth so as not to lose bets to Dutch bookies, or a "Wald Bayesian" who seeks truth to avoid loss of utility. The Wald Bayesian clearly is looking for a recipe for action, and the de Finetti Bayesian seeks at least a recipe for gambling.