this year has been the first time worming has come up for me, never have done it or given it much thought, but I have had some hens get sick and die suddenly, and worming kept coming up as a suggestion or reason, then with them not looking all that healthy it came up again but i still have yet to do it. I was thinking the same thing about getting a fecal, might as well know if there is an issue before I go treating a problem that isn't there.
I have a few hens who definitely have the lice, i picked them up cause they looked so rough and upon checking them out there were lice running all over their vent/hind end....yuck! and i noticed some picking their own feathers out and kind of scratching and found lice, but I am with you I don't really want to treat unless its an issue or i see a problem, and really lice is more of a nuisance than a real issue, but now I am grossed out so i want to get rid of them haha.