My problem with tipping is when it is on a pricey excursion. For example, we were just in Sedona and went on a jeep tour. The fee was $265 for 4 of us. One of the brochures recommended 15% gratuity for driver/guide. I find this offensive when the beginning price is so high. We tipped him $20, but I'd never want to give $40. Another time we went parasailing and paid $100 and saw "tips appreciated" all over the boat.