Well, another way to put it, it requires that fertilization be the explicit focus of the pregnancy and the means of that fertilization not really of the more, um, traditional variety.

I think at the very least there is a hurdle of willfulness (and a monetary hurdle of at least some degree — compared to the traditional alternative certainly).

To be sure it need not be prohibitively expensive, but it sounds like it will go hand in glove with the parental mindset that also seeks out private schooling, tutoring, etc. That probably takes it fairly exclusively into the domain of the well off (and want-to-be well off).