Those levels were the norm when I used to safari regularly more than 10 years ago, so I doubt they've gone down since.

I'm definitely not a fan of copious tipping, but in the case of ranger / tracker, they are so integral to your experience, that in this case I'm happy to reach quite deep into my pocket.

Also, just a hunch...I have absolutely no numbers at all, but I'm going to guess that these people's salaries are probably lower than most people here would think.

(actually, I just Googled, and it's worse than you can imagine...I'm sure there's a premium at the very top places, but it would have to be a HUGE premium to make it into a decent wage...although, of course one has to be careful interpreting these numbers through a Western prism. What I can tell you is that the day to day cost of living in SA is shockingly high; compare prices in a South African supermarket or pharmacy to those back home, and you will get an unpleasant surprise).