My two only eat 20 a piece a day on average, I go through about 250 supers a month on top of the crix, 50 adult crix at a sitting is an awful lot in my opinion. my dragons eat adult crix, I guess if I fed them smaller crix they'd eat that many. don't forget i feed my two a lot of greens on top of their protein. and i only feed them bugs in the evening, they get greens in the morning so they eat them, otherwise they ignore the greens and just eat all bugs. which gets expensive, my two did eat more bugs when they were young but i got them on greens early. the rule of thumb i go by is the eat as much as they can in 10 min rule, but i feed them 3-5 supers bfor i offer crix.
hope that answers your question.