Okay let me type a random string as I might, would I be prompted with such a thing not knowing how important randomness was:
asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfas dfasdfasdfasdfasdfasdf
Should I continue?
Woops, only 1 possible bit :P. Personally, I have the tendency to type aerg if I just hit the keyboard randomly. But not very accurately, so there would be a few misses. But still, 80% of the bits would be the same.
/dev/random is loads better :P.