Legend's first and so far only review comes from the person who helped it mature as a beta reader. Does this invalidate the review in any way? No, because I didn't compensate her for her help or the review in any way. And she didn't see the final copy until it was published.
Experts tell authors to treat their writing like a business for tax purposes and sanity reasons. Consumers expect them to give their works away for free. No business can survive with that ROI model, why should authors have to?
Email marketing is a proven way of getting the word out. Done right, it increases sales. Done wrong and its deadlier than a gun to a marketing campaign. Here's some insight from a developer who's been around the block with this tool.