Supposedly, the Marstrom is the most expensive A-Class.
It is also supposed to be the strongest.
Marstrom uses the same hulls to make his M-18 which has a spinnaker, taller mast, bigger main, and is 8.5'wide.

If the owners are happy with the Marstrom, naturally they rarely show up in the used market.

Yes, I wish I had one.