I rarely give my bearded dragon superworms , when I do it's never more than 2 or 3 in a sitting , she might get some one or twice per week, she'd gobble down a dozen given the chance .
The issues of concern with superworms are :
very high fat content
hard exoskeleton
poor Ca/P ratio
they are not a suitable feeder insect to use as daily staple feeder insect for either skinks or dragons.
I stick to silkworms and crickets and occasionally BSFL for my dragon as daily staple feeder insects.