I use mine on virtually all cut outs. Even if it's evident where they are I'll make a small (1/4") and let the owner see what I'm up against. Once they see what appears to be a giant bee crawling across the lens they won't question your fee anymore :-D
I did one recently where the colony was 12' or so from the actual entrance. I had to drill inspection holes in the ceiling in 4-5 places before I found them. Because of this, they only had to patch a few holes instead of replacing Half a room's worth of drywall.
"In the first place, we should insist that if the immigrant who comes here in good faith becomes an American and assimilates himself to us, he shall be treated on an exact equality with everyone else, for it is an outrage to discriminate against any such man because of creed, or birthplace, or origin. But this is predicated upon the person's becoming in every facet an American, and nothing but an American...There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag...We have room for but one language here, and that is the English language...And we have room for but one sole loyalty and that is a loyalty to the American people."
Theodore Roosevelt 1907