I know a surprisingly high number of kids who are DI or egg donor offspring. One former neighbor had 3 kids via the Genius Sperm Bank. 2 turned out fine; the third has serious problems . He is unlikely to be able to live on his own. The family is one of the “out” ones, and the kids most definitely know they were conceived via the Genius Sperm Bank. The normal ones are grown and have children of their own now.
Another neighbor has 2 DI kids. Father used to write a DI Dad blog, so his kids definitely knew too. I know at one point the family went to meet another family with the kids’ bio half siblings.
Doing genealogy I tripped over someone who was a fairly close relation–roughly second cousin. I know that side of my family’s history fairly well, so I couldn’t figure it out. Turned out a relative donated an egg. (I thought someone had given up a child for adoption.)
In all three of these cases, there was a medical reason a parent couldn’t or shouldn’t have kids.
I remember when my D was in college (at a top college) there was an ad offering $50,000 for donor eggs in the campus paper. For kids with debt, it was tempting. However, there were VERY specific requirements for the donor. One was that you had to be at least 5 ft 9 inch tall. Coloring was specified. Only SATs above a certain level, etc. I remember thinking “poor kid.”
And, of course, I’ve known people looking to adopt who would only adopt a child from the right kind of bio mother.