I'm a very good tipper, however, unless a 15% gratuity is added to your bill, you are not REQUIRED to tip. Its expected, but not required, and if you don't tip, expect poor service or spit in your food the next time you go to that establishment.
The whole thing about waiters and waitresses was in reference to people saying that some ROM developers don't do much besides use tools of people like dsixda and Jesusfreak, and I said that's like saying a waiter doesn't deserve a tip because they 'only brought you food, made by someone else'. Which clearly I don't agree with
Edit: and if you read my previous posts in this thread, on how I feel about donations...no one should feel obligated to donate to anyone. But if a user feels that they want to show appreciation to anyone here, then by all means, donate whatever to whomever.
But I'm not going to treat anyone differently for donating, not donating, accepting donations or not accepting them. I'm here because I love tweaking and modding and building onto Android. If I get asked for help, time pending, I'll help anyone that I'm capable of helping, regardless of their stance on donations.