I mean when you use the account value calculators how does that make a quality from your posts.
in case of
http://www.bctalkaccountpricer.info/ it's
-snip- Post quality is determined by the ratio of the number posts with more than 75 characters in non-quoted text and the number of posts with less than 75 characters in non-quoted text. You can read the whole algorithm which explains things pretty clearly in the OP.
-snip-
the whole algorithm is posted
here.