Amazon (AMZN) could sell more than $2.5 billion in e-books for the Kindle by 2012, Pacific Crestâs Steven Weinstein asserts in a research note this morning. Weinstein repeats a comment Amazon CEO Jeff Bezos made at the D: All Things Digital conference that the company is seeing 6% of book sales in electronic form for the 125,000 titles sold in both print and digital formats. Weinstein notes that in 2007, e-books overall were less than 1% of all U.S. book sales. Weinstein asserts that the Amaz