This is an interesting thread...
My view on the matter:
If I were to book a hotel room for $100 in the States at 13/1 and the exchange rate changed between my booking and my actually staying there - would it be fair for me to ask the hotel to adjust its rate accordingly? Would any hotel even consider or entertain such a request? I guess the answer is "no", they price in US$, I pay in US$ and they couldn't give two hoots of what the ZAR is doing in relation to the US$... The hotel has priced itself - based on its star rating, on its reputation, on what the market is willing to pay and how much profit it wishes to make... Why should it be different the other way around?
Is it important for me to know how much profit the hotel is making at $100p/n and is it important for you as customer how much profit your Outfitter is making? Is there an acceptable "margin" that you - as customer perceive to be fair as far as your Outfitter's profit is concerned?
What is in my view important is that the receiving end of this deal is indeed making a profit - especially if I book my trip a year out... Last thing I would want is to do is to pay a deposit on a trip (or full fare in the case of booking a hotel) just to arrive there to find the doors are closed for business... I personally don't care whether the hotel I book makes a 30%, 50% or 100% profit. As long as they provide the service they promised and as long as I can afford it I'm happy...
Here in Limpopo - landowner's asking prices for e.g. Kudu increased by 100% and more from 2014 to 2015 (in ZAR). My price for Kudu (in US$) increased by 25% over the same timeframe... The Rand was changing at 10/1 last year and is changing at 13/1 now...
To put things in perspective - at 10/1 I got ZAR20,000 for a kudu bull last year and paid ZAR10,000 for it. So on the face of things I was making $1,000 on every kudu bull I hunted with clients (that is gross - not nett profit)...
Right now, I'm getting ZAR32,500 for the $2,500 I had listed for kudu when I was selling hunts at the shows beginning of the year but I'm paying ZAR25,000 for it. So I'm making ZAR7,500 (US$576 at present exchange rate) on a kudu bull. A few months ago - the Dollar was changing at 12/1 so then I was only getting ZAR30,000 for the $2,500 I charged and making ZAR5,000 ($384 in today's terms)...
Bottomline is my "profit margin" on kudu has more than halved in one year - in spite of the improving exchange rate (from a US perspective) and in spite of me increasing my price for kudu with 25%. Would it be fair for my clients to ask me for a discount now because the Dollar has strengthened? Fortunately they don't...
Of course; the favourable US$/ZAR exchange rate (from a US perspective) does give Outfitters more leniency in setting pricing in some instances and many of them (including myself) do. And all of us wants to get the most bang for our bucks - nothing wrong with that.
But personally I don't think the exchange rate should be a bargaining tool when negotiating your hunt.