They most certainly are little poop factories! And once you get your crabs, provided your piggie isn't on any medications and isn't sick, you can feed your crabs their poops, too
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The crabs like them. Hermit crabs eat poop in the wild. Maybe not guinea pig poop in particular, since they don't run in the same circles, but from other animals. There must be something of nutritional value in there for them. They also love the rabbit poop! I haven't tried rat poop, since rats are a little more omnivorous and I prefer to stick to pure herbivores. Herbivore poop just seems cleaner. I suppose I could try chinchilla poop (I have them, too) but it's just so tiny.
Also, *never ever ever* feed your crabs poop from a carnivore - dog, cat, ferret, or even the more omnivorous hedgehog - just don't do it! The crabs probably wouldn't like it anyway, but also it's super unsanitary. Cat poop has germs in it that make it super unsafe.
(Although, super awesome secret? Ferret poop and pee makes the best garden rabbit repellent! I need no fences, I have weasels
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