Similar shoulders go for 6mil to 13 mil on EU ah, so your presumption is incorrect.
It depends entirely what you built your wizard for. If you take force armor, stacking resist upto around 500 is useless and stacking it higher will cost you a load of DPS. So taking into account most wizards on inferno use force armor and ancient guardian, they go for the highest DPS possible, which on shoulders is around 190 intel. (There's actually only 12 items which have higher than 185 intel)