One can expect well earning wife but if he discovers the wife is not able to earn so well as he expected and walks out of marriage, then the expected earning of wife is considertaion for marriage. That is the reason I requested you to see defination of dowry , before you creat unwanted trouble for yourself. The definition is in section 2 of the Dowry Prohibition act.
The defination is that :-
In this Act, "dowry" means any property or valuable security given or agreed to be given either directly or indirectly.
(a) By one party to a marriage to the other party to the marriage, or (b) By the parent of either party to a marriage or by any other person, , to either party to the marriage or to any other person,
at or before 1[or any time after the marriage] 2[in connection with the marriage of the said parties, but does not include] dower or mahr in the case of persons to whom the Muslim Personal Law (Shariat) applies.
3[***]
Explanation II.—The expression “valuable security” has the same meaning as in section 30 of the Indian Penal Code (45 of 1860).