tip rates, what are your standards? Options

[queen]

how good of a tipper are you? what do you consider a "good" tip? what types of services rendered affect the amount of tip you give? define "good" service.

i think i'm a fair tipper. i never tip more than 20% 'cause i don't believe any service is worth the additional 5 above that. also, there's no such thing as "excellent" service to me --essentially, nothing above "good".

my tip rating:
0% for crappy service: basically, doing everything wrong. so far, i haven't had service that would be deserving of this title.
5% for noob service: obviously a new guy. you could tell the person has putforth effort, but s/he's probably just not fit for the job. again, it's rare that i tip this low.
10% for "close-but-no-cigar" service: nothing goes particularly wrong. server is already familiar with the job but is apparently just slow and/or having a bad day.
15% for decent service how i expect to be served every night! fulfillment of all requests in a timely and orderly fashion. server is nice, but not too clingy, maybe even funny, good people skills
20% for good service speedy fulfillment of all requests. giving a little extra. excellent people skills, basically kissing the ground i walk on.

just curious because i know people who tip 5% for what i would consider "good service" and others who tip up to 30% for the same.