You will have reviewers who agree to review the book, but don't, for whatever reason.
Don't harass them. Don't comment about it. Don't. Just let it go.
Yep, this. Act like a professional if you want people to take you seriously. There is still enough of a stigma around self-publishing that you're going into it with an automatic handicap; readers and reviewers and everybody else has already formed an opinion of you, which will be unfavorable by varying degrees, based solely on the fact that you've self-published. The times are a-changing, but slowly. You have to understand that you still have to overcome the assumptions of others and anything you do to make yourself look like an unprofessional person will hinder you greatly.
Anyway, I mentioned earlier in this thread that I have some radio and podcast interviews coming up. The first one was yesterday. It went really well; the interviewers were very engaging and interested in my book. I've already seen a slight uptick in sales for that title which I suspect will translate into a larger jump once the podcast archive of the radio show is available. (The show that interviewed me broadcasts on an AM station that has fairly limited range; their podcast reaches a very large international audience.)
If it does indeed translate into a larger increase in sales, I'll update the thread.
I also ran six ads on a podcast. The ads were very inexpensive so I thought it would be a good marketing experiment. They didn't appear to move my average sales by much, if by any at all, so for me, spending money on advertising is still not looking like a wise move.
However, the interview was really fun! I'd do that again in a heartbeat, just because it was enjoyable, even if it didn't bring up my sales.
Meanwhile, the original book I self-published continues to sell like hotcakes even without any promotion at all. I can't explain it. It regularly rises onto the Top 100 lists on Amazon and then backs off again in pretty predictable cycles. I just can't figure out what is fueling its popularity, except that it's a good book. Readers must be recommending it to each other privately, because I don't see a whole lot of discussion of the book online. It's a mystery, but one I'm very happy to be a part of!