Seems everyone hates this arc, but I find that what the man doing is pretty endearing, no?
He simply states the ugly truth about how society and the showbiz world work, sure it is not the kindest thing to say but it is still the truth nevertheless, and his argument about "pillow business in biz world and normal relations are same" are also not too far from truth. especially in nowadays Japan's society.
It is also true that to get into matchmaking in Japan, men have to state their income, and in reality one of the reasons why Japan has the lowest marriage rate is because women kept demanding higher and higher income rates. (You can watch a recent documentary from "Nobita from Japan"'s channel about this). If matchmaking, dating, and marriage have money give and take as the foundation, how is that different from what this man doing?
To add, he didn't force Sumire and he didn't create a situation where Sumire had to agree with it, he was even willing to start from platonic relations. some say what he did is unrealistic, but in modern society, getting into scandals involving women could destroy your career so what he doing is pretty smart as he wants to establish a clear boundary in a business way to avoid future problems if things goes south.