The reason?... Pure profits!!!
Its a matter of profits for the local Dish Retailer.
Legacy hardware costs:
Lnb dual = $15
Dish sw21 = $15
3x4 switch = $15
DishPro hardware costs:
DP Dual Lnb = $30
DP21 switch = $30
DP34 switch = $60
As you can see, Dish Pro hardware is twice more...