I wanted to drop by and share something with the collective. Some of you know me, some of you don't. I used to be a serial writer but I've transitioned to only publishing, and I'm about to go full time.
When I was a serial writer, I saw a lot of to-do about book trailers.
In short, do them for your readers if you'd like or it's part of your brand, but they don't really work well for acquiring new readers.
I have some pretty loud trailers, rap videos in fact. Here's the URL to the trailer for book 3 of Delvers LLC (which just came out).
So far, my experience is that trailers are a novelty, but most readers don't really care. The louder, funnier, or better looking they are, the more fun your readers will have. My rap videos just keep getting more over the top, and that is a deliberate choice. The more I groan and hide my face, the more my readers enjoy them.
For ads, you're better off with still images or type. I think a possible exception might be a gif.
It seems like books + videos just don't mesh in the minds of the consumer.
Anyway, others may have different experiences, but my take is that your promotion money is better spent elsewhere. That said, I do plan to continue paying for these rap videos for every book in the Delvers LLC series. Some readers expect it by now. Plus, who knows, maybe they will go viral or something. You just never know.
The book trailers that are just canned music with a few generic, solid-color screens w/ type are never going to go viral, though. They're probably not even worth your time to throw together. Based on my experience, a shot of your cover and a really well written blurb seems to still be the best way to interest new, would-be readers.