Only a billion or so more out there. No great crisis. It was interesting to find out though. It is indeed unusual to see Victa two strokes being used by mowing contractors/ runs. I'd be a bit concerned about the fumes day in day out, but I don't imagine four strokes have catalytic converters either. Councils used high output powertorques for years in their commercial grade equipment.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!