That is a hilarious looking bike, I literally LOL'ed when I saw the orange one.
You have to have a very strong sense of independence to ride that.
Oddly I don't find the red one funny looking.
It's actually a good design because the small tires allow the rider to ride slow and stable and maneuver for polo.
It would be great to play polo with the larger wheeled bikes; you'd destroy the competition and might get banned.

Yes, the BMW will be a classic collectors bike, it's a sweet design.