Obviously depends on the age of the gecko and size of the crickets. IMHO if you get the proper sized cricket for the gecko (I say slightly smaller than the head width to start) then we usually go 3 crickets instead of one serving of CGD. Right now we only have adults, so that's 3 of what most suppliers consider "large" crickets and then the 3rd day back to CGD - we feed insects to adults about 2x a month for psychological stimulation.
For a growing gecko, we feed insects more like once a week to once a week and a half. It really does help their growth and, at least in our opinion, has to be a little more natural than eating out of a bowl all the time. Smaller crickets, but we stick to an average of 3, like any geckos though, you will find yourself between cricket sizes and may end up feeding more. With the disclaimer that with a crestie, I wouldn't jump sizes as fast as I would for a growing leopard gecko for instance - mostly due to the difference in jaw pressure and ability to kill prey. (My other favorite "must always have" gecko.)
Hope this helps - if you give me a little bit more info on your gecko's age/size I could be more specific on my recommendations.
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