Jilly Dybka released her self-pub book recently and has this to share about the books early impact (link):
Book release announced May 16, 2008
Stats provided May 25, 2008
400 daily readers of Poetry Hut
83 downloads of Trouble and Honey
5 individuals donated via PayPal
13 copies ordered via Lulu.com
Jilly provides her own interpretation of these numbers, but the numbers seem a bit off.
To make an accurate assesment of the data she would need to track daily page views, daily individual items sold (and/or downloaded), and daily revenue. Or at least track it weekly. From the collection of data she could discover and project sales trends, adjust marketing and promotional compaigns, and (in general) provide herself a statiscal analysis of the publishing effort of Trouble and Honey.
IMHO, I think it is too early to determine anything regarding this chapbook release.
Coffeehouse Junkie 