The most important consideration in a partner is someone that you respect and admire. Healthy relationships are those in which both parties respect and admire each other -- this way, the relationship is between equals.
It is of course always possible for two high earners to marry. But often, the work involved in earning that money keeps the two apart much of the time, and this produces a weaker bond -- kind of like how two south poles of magnets repel each other.
If, instead of finding someone with qualities similar to yours, you respect and admire them for qualities you don't have, and they in turn respect and admire you for qualities that they don't have, this can make a much tighter bond. Instead of similar magnetic orientation, this would be opposite magnetic orientation, in which case the two stick together quite tightly.
If you already make good money, perhaps you aren't looking for someone who also makes money. Perhaps you would admire someone who is organized, or thoughtful, or artistic, or motherly or fatherly. Perhaps someone who is athletic, or handy, or smart. The point being -- having money is just one of many attractive qualities. It indicates either hard work or intelligence (unless the money is handed down, which creates a downward spiral over the next few generations until the money is gone.) There is nothing wrong with being attracted to someone with money, as long as what you are really appreciating are the qualities that allowed them to earn that money.
But if all you want is their money, then this is just greed, and you will earn yourself an unhappy partnership.