I am guessing the inclusion of the centre diff could be partly to blame. They had a price point they wanted to hit and by adding the extra diff, they needed to make something else cheaper.
Not sure if they were also tying to make a gap between these new 223s vehicles and the 4s v2.5 which also have the centre diff.
The older Vorteks used to be more expensive than the rest of the 3s range as it came with a different transmitter which has their smart battery level and possibly stability control or some kind.
This updated version brings it in line with the other similar vehicle's.