I don`t know why?
How to improve the post quality?
Those pricers aren't human, so they make an estimation of the post quality. One could potentially be a very high quality poster that is labeled as "very poor" because his answers are always very consise and short, but straight to the point. An estimator wouldn't pick up on this.
I think a general rule is: be constructive. Try to add something to the discussion, even if it's asking on-topic questions... Try to avoid duplicating answers. Try to use reasonably good syntax (i'm not a native speaker myself, it's pretty easy to spot this, but i hope my posts are readable by anybody who is fluent in english... They might get irritated by my mistakes, but i hope they'll still get the point i wish to convey)
I've looked trough the first page of your post history:
https://bitcointalksearch.org/user/davis196-710218
Results:
9/20 posts in offtopic
2/20 asking to join a sig campaign
1/20 in politics and society
Leaving only 8/20 for actual bitcoin related discussion... I haven't checked those 8 posts, but i hope you get the general idear
EDIt, i've just looked at the second page: https://bitcointalksearch.org/user/davis196-710218;start=20 => allmost all posts consist of maximum 1-2 lines... So, an account pricer would see this as low quality because it just picks up the ammount of characters and words
some impressive results i must say Post Quality: Excellent