It's not the storage, but processing with NR and DataDog is what's expensive. That's why the efficiency team asked to not have their actions logged in the first place.
I can honestly not tell if this comment was intended to be taken seriously, or if it was tongue in cheek.
I really want to believe it's tongue in cheek because the thought of asking not to be audited in order to save some compute on Splunk queries or whatever is very funny to me.