I can tell you from my days in the practice that clients "tip" their attorneys, just in a different way -- there's the dinners at the incredible restaurants when you win a case or close a deal, the thank you trips to world capitals, etc.

Heck, even vendors tip -- three times a year, you can count on huge baskets of baked goods on your desk from various vendors, hoping to either keep your business or woo you over to them. On a cold morning, that was almost as good as a first class trip to Paris.