because love isn’t meant to be transactional, overtime your love will mix in with the transactions, the ‘love’ will be dependent on such, and then it will corrupt the relationship. Also, there is a form of screening, a person cannot tell whether you are being nice for their money or that you are genuine.
Either way, a man with self-respect will not allow their financials to be leveraged even in benefit of a relationship, they would rather have you love the way they are.
A man with low self-respect will always do the opposite, they will use whatever financials they have to boast their value, or gain control within a relationship, this inadvertently makes them susceptible to inauthentic love, as it attracts superficial people. It will likely not be long lasting due to both the man and woman being in a displeasing transactional relationship. Look at any immensely rich couples, most of them probably see other people on the side. With men who usually boast money too, they end up being more insecure when it comes to their actual selves, they also tend to be more promiscuous.
A good relationship though is not exempt from purchasing gifts and other things, that is normal, it just shouldn’t be the focus of it, but rather an addition, something done out of genuine compassion and not a feeling of duty or something to leverage so the person doesn’t leave you.