I have no idea where or why you have that impression, I have always dusted crickets and thats the end of that story. For the last 6 or 7 years, the majority of our monitors are larger types and we do not feed them crickets, so with those, they get no suppliments what so ever, there is no need.
Again, with crickets as a sole diet, then there is a need, so we do. If you feed pinkies or chopped fuzzies as a staple to your small monitors, then there is no need to suppliment.
We do still have a few individuals of a few species of small monitors. So there you have it, I hope this makes a better impression. Again, it boils down to need, not regime or protocal.
I know you didn't ask this, but as usual I will at this anyway, I do not do whats not needed, its important to understand why. Not doing whats not needed gives me time and energy to do what IS needed. Thanks FR