Apk,
(I agree with you on multi-quoting, incidentally.

)
It's true that Amazon has a very large customer base. However, I remain skeptical on whether user base interests are spread equally across, say, Amazon customers and B&N customers. My own anecdata indicates that Nook owners are more indie-author oriented and Kindle owners are less so. Note that this worthless anecdata is based on about 3 people I know in Real Life.
Hir is gender-neutral for his/her. Zie is gender-neutral for she/he. No idea where I picked it up -- Slacktivist, probably.