As much as I admire and am an enthusiast of the Victa two cycle, I can definitely understand why people prefer four strokes. They are quieter, don't make your clothes reak of petrol and just take straight petrol.
All very appealing to those who keep their lawns cut regularly and who don't want to annoy their neighbours.
They also don't realise how durable the two strokes are and their capability in rougher conditions. The amount buying four stokes has the snowball effect of making everyone think they are the way to go. The demise of the Victa two stroke won't help the situation.
Powertorques are going to go up in value once rarity increases and word spreads how uniquely capable they are.