Your right, they arent worth the work unle your gettng paid.. in fact, mot cut outs are not worth the work without getting paid..
As I understand it, a bee has the ability to "regress" if the situation requires it.. Meaning, those glands become productive again, and if necessary, as in during a trap out, if the foragers are not returning, the nurse bees will advance ahead of their time to go out and forage.. this is what depletes the hive.. with no bees coming back, the nurse bees will start going out...
In your hive that is collecting all those bees that cant get back in, you will have all sorts of mess going on.. bees that have given up some time to become foragers are suddenly going back to nurse bees.....
Adding a a couple frames of capped brood (From nucs you need to cut down the numbers a bit to maintain?) will give them a major boost in young nurse bees. But you have to have the resources to give them.. if you have to pull those resources from a production hive, your right back to it not being worth the cost again.