@Donald28
The practical motive is:
Although there are Airbnb guests that do not know what super host is,
there are the ones (usually experienced Airbnb guests) that only book with superhosts because they know that a super host are usually able to provide a good stay and know on how to fix any issue very rapidly.
So, if the potential guest are searching for accommodation using Airbnb platform, you have more chances to get booked if the potential guest uses the superhost filter.
@Paul154
Being an experienced host, you know that, five star has nothing to do with 5 star hotels and luxury. It has to do with having a high degree of recognition within the type and category of accommodation that is offered.
You say - "I suspect superhost listings are probably faster to book. They market better. "
To be honest, my earnings and bookings has not increased drastically since I became a superhost. Moreover, supehosts do not have the power to get much better prices, mainly in a very competitive market.
Sometimes I miss the time when I did not had this badge. I was less stressed and less concerned with stars. I think the earnings it was the same or better than now. About that I can not say for sure.
Anyway, so far, I still care for my superhost status.