Because often that type of relationship is highly abusive and the power structure is horribly lopsided. Inherently there is nothing wrong with money being a priority in a relationship, but in my experience the people who set out with that goal often end up very unhappy because a relationship based on money becomes transactional in its every nature.

The "good" partners wont be interested in a partner who is just there for money, so they wont be interested in you.

You do you, but i dont know any happy gold diggers, or people with a sugar partner with the exception of a single couple, and in that case the husband had a high paying job but his wife's income was 10x his so he was not working because they needed the money so they decided he should be a state at home parent. He sees his job as being eye candy for her, he takes care of all kid related things, cleans the house every day, and then spends 2-4hr a day at the gym so he is in peak physical form for her.