Does that notion change your mind on the cost of renting a rifle?
No. Owned rifle, sitting in a rack, or being carried by client around makes no cost to anyone.
On point of wasting the ammo, it could be arranged like price per round fired, or more gently, 1st box of ammo for free on account of overall logistics with beer, wine, diesel, food, laundry, and hunt package, etc, and 2nd box of ammo spent, XX usd per round.
But for bad shooting, the question and solution is different:
It can get to a more specific question.
How incompetent client can be, and what PH and outfitter can really tolerate. And how to handle this situation?
It starts first, with first (presumably honest, and in good faith) exchange of client / outiftter on first contact, when discussing the hunt, a year or 6 months in advance.
At that time, it should be clear what is the clients experience and skill, and what are the clients expectations for the hunt?
its not even too late for client to make some shooting classes or training if need be.
2nd part is testing of client and rifle at range. (with his or rental rifle)
By that time, the things should be clear.
That would be for true gentlemen, a situtation that I could imagine.
But lets imagine, ungentlemanly client?
He says on first contact, large experience, being true marskman, etc...
Comes in camp, cant hit a target on paper.
Now, PH now has a problem. And client as well.
Client wounds the elephant, lets say.
Now what? Charging 50 usd per day of rifle hire, 60 usd per shot fired.... not a solution.
Charging full trophy fee for lost ele, will cover the damage, but will leave bad taste to everyone.
But price of gun rental even if for free or tripled will not solve the issue.