Mind the Gap--veinglory

It has taken over a year, but I am finally getting there. Where? The place I had in mind back when I first started this blog. I wanted to help authors share information about scam or incompetent publishers. And I wanted to help authors find out which epublishers produce the best sales.
The funny thing is that in all this time I have had no negative feedback about the blog. I mean that, none whatsoever. The worst responses I have are all public as blog comments and none of them are enough to keep me awake at night.
But in a way the scam or novice press beat was probably the easier of the two. That kind of publisher is either not terribly influential, or improving in a way that will cause me to change my assessment. Posting publisher-specific sales figures might be a different sort of situation. I mean on the whole I believe in saying what I think as fairly as I can, and when I am wrong I am wrong. But sales figures are inexact, the sample is biased and small and usually out of date. So I am struck by an uncharacteristic fit of self-doubt.
Is posting publisher specific sales figures a step too far? How can it be when it was the whole reason I got started in this blogging biz?