I'm usually one of the faster times, but not the fastest on TV by any means. I am a really fast reader, I've seen most of the survey questions a thousand times, and I've got my demographics macro'd into my mouse and keyboard (my age, state, gender, etc) which shaves off a few seconds per HIT which can really add up.
Like
@JenniLeigh said, it's not a race. I've been rejected several times for being "too fast" so there's silver linings to being a "careful" reader.
TV also separates times into categories; I'm in the second to fastest. So you can find your column and compare your times to people that are closest to your speed. For me; I'm generally faster than the single average so I don't really trust it, either... but for the reverse reason
ETA: SANITY > speed, money, and all else.