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I think it depends on how you use ghouls in your campaign. I have generally regarded ghouls as itinerant scavengers of corpses. That explains their presence in tombs. So they're usually involved in acquiring corpses, dismembering them, and eating them. My ghouls do not go out of their way to hunt the living, but are happy to dine on them should a party invade their turf or enter a cemetery at night.
But maybe your ghouls are different. If they hunt the living, or serve a necromancer, or have an underground city, they will have to engage in other activities as well. Give then a back story! Why are they where the party finds them? Then you'll realize what they must be doing with backs turned. They won't be idle---their hunger is too great.