It seems that fewer of the piston Commander owners and pilots migrated over to this forum from the old board, than turboprop owners. Not quite sure why, but perhaps they were more invested in the older board and didn't want to start all over. Plus, there was some excellent archived information over there. Also, a lot of these same owner/pilots and aircraft have gone by the wayside or retired since the original board was created, so there's that. I see a lot less 500B's at airports in general these days, used to be there was always at least one at pretty much at every airport.
Fact is, I don't see that many TP's either. Used to be a 690B across the hangar for me owned by Nick Martin, but haven't seen it in years. Maybe he sold it.