I do really think that PG often glosses over what he really means when he says "success." From a critical view, you could interpret the word to mean solely financial/economic success. Given his occupation, I would imagine that's his intention with the term.

But if you replace that term with something like "virtue" or "eudaimonia" and read from that perspective, there can sometimes be some truths to glean from his writing. Nothing really novel, but interesting to read nonetheless.