This pretty much hits the nail on the head. It saves money, space and time. It saves money up until something gets sick. I don't know this for a fact but I would bet that the sick animals get culled because it is cheaper to cull them than to treat them.
I bet these animals are kept in dark tubs as well so the breeder cannot see them. Many of my young babies go ballistic if I skip a week. Especially the spiders. There is no way you could look at that and not feed if you have an ounce of humanity left.
The most entertaining excuse I have heard for not feeding was "I cannot get enough rats to feed as often as I want to." This is an actual excuse from a very well known breeder. Maybe, just maybe, if that is true, the breeder needs to rethink his/her operation.