Yeah your right wpi is a superior protein source, though i'm not sure its actually better for your health per se.
I get my wpi from BN in 5kg lots, though this time i got wpi raw usa from BulkPowders for a cheaper price than BN, got 6kg at the same price that BN charges for 5kg, only difference is its unflavoured wpi from the usa. Taste doesn't bother me cause i mix it with either dextrose(Post Workout) or Refined Powdered Oats as a meal replacement.
Was gona say i'd give you $50 for it, but not sure i want to go backwards to wpc. I used wpc for over a decade, once i hit wpi up i never went back, its like going from coke to crack, once you hit that rock you aint ever going back to regular powder you know what i'm saying.