No matter how high, honestly. Because even with maids, the underlying sentiment there is that I count for less. In case of conflict of interest, partner earning more means I automatically loose. "I earn more therefore I contribute more therefore I get what I want" is situation I would find pleasant. However, "I earn less, therefore I contribute less, therefore I have to suck it up and accept being second" is situation I would resent and dislike.

Your wife and you situation sounds like falling into "mutually agreed upon in advance".