Dermestid Beetles and their larvae feed upon death - cricket breeders frequently place them in their bins to keep up with cleaning of the dead bodies; which lowers the amount of cleaning and smell produced by the crickets and helps to prevent the spread of disease. They shouldn't be touching live crickets unless they are in the process of dying or good and dead. Crickets are kind of nasty little guys, they will eat the **** out each other if there isn't adequate space, food, and moisture for hydration.

But dermestids have their pros and cons, depending on the environment you live in, they can get out and be a nuisance... I think there are more worthwhile feeders for you to pursue than dermestid beetles that are equally inexpensive and easy to breed. Perhaps you may want to consider roaches, or soldier grubs ('calci-worms, phoenix worms). They are more nutrionally sounds and make great feeders, while being fairly easy to raise.