Speaking as a former server:
First - everyone get off the 30% thing. The OP said in her post and also repeated that this is what SHE PERSONALLY uses as a base and deducts from there. She DID NOT say that everyone should use 30% as a standard.
Second - Yes we all pay taxes. Guess what? Servers are taxed on their tickets (8% of the total bill for each table) and their wages (usually minimum). What makes this unfair is that not all tipped jobs are taxed. Hairdressers, limo drivers, massage technicians, to name a few are not subjected to a minimum reporting of their services or fares by their employer. The government just assumes people cheat but with servers they have a way to get their cut. With other jobs, not so much.
Third - I don't expect more money for messy kids but it would be nice. I usually told the hostess not to put small children/babies in my section. (Sorry but I'd say 7 out of 10 of those tables were an issue. The sorry state of parenting.) However there were the times when a family would leave an unholy mess of soggy smashed saltines all over the table and the floor and the busboy would REFUSE to clean it. Therefore if I want another party at my table, guess who cleans it?
Fourth - I personally like the adage "Tell me what kind of tip you'll leave so I know what service to give you". It works in reverse as well "Tell me what kind of service you're going to give me so I know how much to tip." Though once the meal is over, you already know what kind of service you got. I could smile, be prompt, refill glasses, give great service and get stiffed or 10% for a table of 10. If I had known that, I wouldn't have worked so damn hard for you.
Fifth - I too am picky on service. I don't blame the waitress for the food. That is the chefs job but I do blame them for chatting in the side station for a long time when they should be working. Check your tables, ask if they want dessert, box food and get their check out quickly when they don't want anything else.
Sixth - I know that I had to split tips with the busboys and the bartender. I refused to tip the dishwashers since I tip who works directly for me. The busboys clear and set my tables, the bartender gets my drinks. When I tend bar, I tip the dishwashers since they wash and bring my glasses.
Whew. OK, I'm done. Don't agree with the 30% as a standard though she is entitled to it. Her point on the way servers work is dead on. Also what is really sad is that overall, women are the worst tippers. Especially "ladies that lunch" and I hate being lumped in with my gender since I tip well. Usually I mention that I use to wait tables and then my service improves. Ladies, don't be so damn cheap. Just because some guy isn't paying for your food doesn't mean you can't cough up a few extra bucks for your salad during your "ladies spa lunches".