BAYES scores

[joe a]

Curious as to why these scores, apparently "stock" are what they are. 
I'd expect BAYES_999 BODY to count more than BAYES_99 BODY.

Noted in a header this morning:
*  3.5 BAYES_99 BODY: Bayes spam probability is 99 to 100%
*      [score: 1.0000]
*  0.2 BAYES_999 BODY: Bayes spam probability is 99.9 to 100%
*      [score: 1.0000]

Was this discussed recently?  I added a local score to mollify my sense 
of propriety.