Excellent bullet points. I especially like the point about how many books go out in each email. Lots of promo sites promise promoting to a large email list. Sounds good to have your book pushed to 55,000, but depending on the number of authors whose books are promoted in that same list, your book may not even be seen! I am still seeking to grow mine, but I also enjoy my small list. I know that the books I review and promote (I highly promote the books that I review) are actually being seen and not drowned out. Sometimes, less is more.