Don't rely on the analysis of that website.The algorithm only calculates the quality of posts on the basis of its length.If you have a lot of posts with 2-4 lines of words ,it will predict it as a "excellent quality" .Similarly,if most of your posts are short in length,it predicts "poor quality".A post could be short yet be constructive just as a post could be of 5 lines but completely nonconstructive.If you notice your account price will also be shown way more than the rates they're sold at the forum.
Indeed 0.044 is rather high for OP's account.
However, the analysis of that website IS commonly used to buy/sell accounts, since it's neutral.
If a seller says bctalkaccountpricer.info rates the post quality of the (undisclosed) account he's willing to sell as excellent, it must have a decent amount of lenghty posts.
Offcourse, this doesn't mean a thing, but since most account sellers don't disclose the uid of the account they're selling, it's the best tool for the job i've seen so far (unless he can get a trusted escrow to validate an account manually)