What a curious post. Pure mathematics is nothing but ideas - often very deep ones that very few people are capable of originating. If you take Adams literally, then mathematics is worthless. Is the idea of the Ricci flow, which Perelman used to prove the Poincare conjecture, really useless? The problem Adams is addressing, so far as I can see, is that many people think trivial, easy-to-have ideas are somehow valuable…
Adams seems to have only had utilitarian ideas in mind. His post didn't strike me as curious, however. I did not expect him to discuss pure mathematics.