Three ways that pip is corrupted by wealth?

1) Pip becomes obsessed with Estella. He knows that wealth and becoming a gentleman are the only two things that will make a relationship with her possible. These two goals become the focus of his life.

2) Pip's relationship with Joe is put at risk because Pip finds him to be an embarrassment. Pip would never have treated Joe so uncaringly prior to being financed by his benefactor.

3) The one thing that hurts Pip more than any other in his corruption by wealth is his sense of self. He forgets who he is, and he strives to be someone else.