However, the context in which I was trying to say that a transaction is OK is not entirely clear to me. But suppose it is some kind of relationship based on certain rules and contracts. I can say that friends with advantages have some behavioral reasons. Personally, I think this type of relationship tends to be volatile because, after all, we are all people who have basic experiential feelings. If rules were so easy to have or to obey, our earth would have been the honest planet of the Milky Way.
Many of my co-workers and friends have encountered people who tend to keep it that way, whether it be to protect their vulnerability, to channel frustration, to feel dominant over other people, etc. Take the example of Fifty Shades of Gray. Contract-oriented sexual orientations.
After all, I am not a judge, nor a father, nor anyone's desire nor way of life. But think or act wisely.