Considering that guides and staff at the lodges get free board lodging and rations, above their salary. One has to consider that in a normal industry, people come to work, work hard and don't get any form of tip at all. Do you tip your electrician, plumber, or boiler maker?
Most of these camps over employ people, and as a result the work load is spread pretty thin, and it would be a pretty cushy job for an average person. Some times I have seen staff outnumber guests by 2 to 1 or even more.
The only real skilled staff are the cook and guide and the manager. These staff are key to the success of the lodge, and its the lodges responsibility to keep them from hopping next door.
I am dead against tipping. But I tip anyway, as its expected, but I tip on the very last day, and prefer to drop it in the tip box. I remember having one shocking guide who made absolutely no connection with us, but tired to sugar coat us with comments like "I am going to miss you when you leave" etc.. Fact it I tipped him anyway, as it was expected.
I would rather tip for exceptional service. That is when you get more than you paid for, or expected. And that would be $5 per day. Or $10 per day in the tip box.