sentence1: Finn's awkwardness keeps him inoffensive, but it thoroughly obviates the dramatic arc that's the whole point of Dickens'  If success doesn't change Finn for the worse, then his rejection of the high life doesn't entail the same kind of sacrifices--or come as a consequence of some harrowing epiphany.
sentence2: There are some who would argue that had success changed Finn for the worse, rejection of the high life wouldn't be looked at as a sacrifice in the same sense either.