I have a buddy who owns his own outfit in Alaska including his own plane, I've talked to him quite a bit about costs etc. Trust me, they aren't getting rich doing it, if guides are lucky they run on margins similar to most any other business out there.
Never been an outfitter or fishing guide that has ever gotten rich doing it. Just ask them! Gotta pay for those new F250's, huge lodges, new boats and planes. Nothing left over to buy a taco.