Yes, I think that's the basis behind the links on the books going to Amazon. The Tanuki (and hence Rachel) can then track books purchased. (As the financial aspect of the getting people who would welcome gay characters to specifically say so.)

("...it's over there because I'd like to be able to tell how many purchases result, and I can't do that via click-throughs any more because of a sales tax dispute between Amazon and the state of California," she says in one of her posts.)

However, I think if that's what she's doing, then I think it should be stated more explicitly in the post on Tanuki_Green's LJ. For one thing, people might then deliberately purchase stuff that way.