So many Japanese guys have offered me money on the street at some walk up enjou kosai style. I think the point of that is to get sex with the girl you want. To be honest, i find it a better method than ordering a girl on a picture which can be photoshop or bait and switch.What would be the point of pickup or dating in general, if you did that?
Its a way to get with a girl who is 100% your type for looks, and i dont see how it would be more disrespectful than asking a girl on the street to date you or have sex for free.
As for girls, i know many girls who would tell a guy to pay for their time when they get nampa'ed and if they are kyaba or escort, its logical that they may not want to give their services out for free but may want to give the guy a chance at getting with them this way.
Of course, imo, nothing wrong with sinapse or any guy decining that offer if their are not willing to pay, very understandable.
Also, i wouldn't say sinapse goes for vulnerable women since he likes kyabajo who work with men and are masters at playing them, they are not naive baby birds at all.