I raise my own crickets to feed ten California toads, and 5 adult and 13 hatchling fence lizards, and don't go through 1000 crickets a week. Are you sure your geckos are eating them, the crickets are not somehow escaping instead, or hiding in the substrate?
:A good rule of thumb for all geckos is to feed them a food item that is about 90% the size of their head. Food items much smaller than the gecko's head tend to be ignored in favor of larger food items. Hatchling leopards can be fed 2 week old (1/4" crickets, older juveniles(year or less old) and adults can be fed 3 week old (3/4" crickets or larger depending on the size of the gecko. Feed hatchlings 3-5 crickets or small mealworms daily, juveniles and adults at least 5-10 crickets/mealworms or more- adults 3 times weekly.
So for six geckos I come up with about 100 crickets for the lot for a week. Of course if you are feeding really small crickets maybe try a larger size.

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