My theory is men who do this to an extraordinary degree, far removed from the aprox. $100. earned at times, continue donating their sperm because they are lonely and want a family, but don’t feel connected to anybody or much anything at that time in their lives. They are literally planning to create someone to care about, presuming that such persons would in turn care about their donor father.
There are worse motivations to have, but this one is quite a gamble.
I would think the majority of women who conceive via ‘donation’ would prefer not to tell their children this was how they were conceived. For a guy to do this over 90 times, and then to make plans to seek out each one. That sounds a little desperate. Not sure what he wants from them. “Thanks”? He didn’t ‘create’ them, he just enabled their birth. Somebody else has provided a home.
This is becoming very common. Many women are unmarried, without children and over 35. Many of them want children and depend on these donor banks. You are right. The men who donate do it for a variety of complex and not always sterling reasons. The children they father will have a tough time as it is being raised without knowing their father but will also have unique biological challenges since they may meet half siblings who are unknown to them.