Rich Muslim men having four wives: Fair?

It is a real fact that rich Muslim men have four wives at the same time as their religion allows. But is it morally and socially acceptable, although moral values sometimes agree with religious beliefs and values?

A rich man may economically satisfy all the four wives. But never can he satisfy the social needs of the four wives equally because of the natural and social differences between the four wives. One of the wives may be socially more attractive treating him more than the other. She may also be naturally beauty, sexually fit, etc. Thus, the man can never satisfy the four wives equally without any bias and that is morally as well as socially unacceptable for the wives.

The initial premise, though I don’t know more on this issue, is said to be that females were over males during the time Prophet Mohammed wrote Quran. Besides, Prophet Mohammed had the desire of increasing the Muslim population. Therefore, this provision in Quran might be acceptable that time. But now, that male-female matching problem is not prevalent. Would it be fair to have four wives on the basis of religion, unless the wives themselves like it?