They should be owned only by those with utmost restraint.
Had found two, and was in the process of killing one, lionfish. Honker saw the second lionfish, maybe six feet from me. He honked loud and long. I stopped what I was doing, signalled OK, pointed at the second lionfish, and returned to my task. He kept honking and honking. Finally I stopped again, waved wildly at him, and pointed at the lionfish saying loudly, "I know! I saw it! Okay?" and pointed to the lionfish already on my spear. Fortunately the second one didn't hide from his crowding it, and I got it, too.
Back on the boat, he asked, "Did you get the lionfish I showed you?"
I asked, "The one you were screaming at me about? I had seen them both and was killing the one closest to me first. When you first honked, I signaled OK and pointed at it."
He replied, huffily, "I wasn't screaming. I didn't see you point."
My reply, "Sounded that way to me."
I swear I heard some snickers...
Yes, many abuse them.
I've had one for 150 or so dives. Honked it less than 10 times, and at least two of those were at DM request.