Everyone DOES expect a tip in our culture, and I think service industry salaries reflect that. For that reason we usually tip, unless the service is terrible. I consider the tip a part of the cost, and if I cannot afford the service+tip, I simply do not purchase the service.
When I have used the services of a fishing guide, I have never been disappointed. They have all been great guys who have worked hard to make sure we had fun, and educate us along the way.
That being said, I sure do enjoy traveling in places like Japan, where the taxes are already included in the price and tipping is not the norm. It is soo simple...the price is the price. Heck, I've even had a restaurant owner chase me down the street to return money I "forgot" in his restaurant.