First of all, not all humans think the same nor are they alike, what doesn't work for you might work for some other guy.
Second, I am not talking about the manga, I am talking about the people here treating prostitutes and sex workers like they are some kind of disease. "Oh, you can get them, that's fine but if you want to be with them, that's a huge no-no".
Third, do you know or understand why people turn to prostituting themselves? For the vast majority of people, it's the only way they could think of to live, to survive. For them, there is literally no way out if they want to continue to live. Sure, for some it might be something that they enjoy doing, but it doesn't make them any less human. If somebody helps them leave, is that so bad? And there's a reason why its considered to be one of the oldest professions out there.
Fourth, there are plenty of women and even men out there with body counts in the double, even triple digits, more than prostitutes. They do it for free, is that what separates them from the sex workers? But people still flock to them, still want to be in a relationship with them, sure they are people out there that love talking shit about people with high body counts but I don't see them being treated like dirt like prostitutes are.
Fifth, you are already assuming so much about people and their lives that don't even exist, you are spouting the same bullshit that people online do to attack women trying to live their lives. It's not even effecting you, but you consider it your god given duty to judge, shame and attack. And for what?
Sixth and final point, if we come back to the manga, its like I mentioned earlier, you cannot chose who you get to fall in love with. You can chose to not be with them, but love you cannot control, however hard you try.
At the end of the day, sex workers are humans too. If a guy wants to be with her, who are we to judge? If she wants to continue doing what she wants to do and the guy knows about it and still supports her, then it really doesn't matter. You might not approve of it, society might not approve of it, but does any of this matter? It's their lives and their relationship. You might consider the guy a pathetic fool, a loser, a cuck, whatever you want to call him, it's up to you but at the end of the day it is their happiness that matters, and that's all there is to it. I am not here to change your mind, because I know you aren't going to, I am not here to talk about whether prostitution is moral or immoral, all I want people to do is to see a person for who they really are, a human being trying to make their way in this world with the person they want to be with.