Would dilute their luxury branding here...and insufficient margins for the basic ones.
There are a few firms shipping them over, both Benz and Puch, ex military and civilian ones. This would be a good excuse for a trip to somewhere in Southern Europe to find one to bring back. Importing is relatively straightforward.
I cam very close to getting one a while back, but I am holding out for a diesel UMM Alter...just need to get there to find one.