I needed to be a little more specific, but I'm thinking along the lines of providing a free audiobook through the likes of Awesound. So rather than just give it away (which can be done) I might be able to "give it away" via a promotional code that gives me an email address that might be added to an email mailing list. In a way, it doesn't have anything to do with Amazon or ACX, it's all based from my own website.
I'm more wondering if people's general wariness about signing up to any mailing list is starting to hurt that "mailing list" strategy. Or maybe the question is whether AMS and FB ads have trumped (Jeez ... can we still use that word?) the mailing list approach.
There's a slight problem with the bolded part there, or maybe I'm reading it wrong. Anyway, that's a no-no. Adding someone to a newsletter because they took advantage of something free you offered, but without their express permission, is against all the rules governing the use of people's email addresses.
All you need to do is offer it as a free gift for signing up. Period. Don't harvest them without their consent. Give them the promo code to redeem it and the link to it in the confirmation email that they've signed up.
Also...what Simon says is the way I work with that as well.
Give them a reason to be there and make it a two-way street. I have a small list when compared to some...okay, it's not small at all, but comparatively speaking it is. I got about 1500 from a promo that I never even added because I felt weird about it. I like organic, and Opt-in for Instafreebie and that's pretty much it.
I give them a lot, and they like my work, and they buy my work. That's a great relationship. What you're doing is starting a new relationship with people you don't know yet, but hope to. Go ahead and start it with a big give, then foster it by being helpful.
The key with newsletters is that most readers who like books enough to sign up for a NL read a whole lot more than any one author can write. Certainly they can read more than I can write, so I'm not looking to push things on them all the time.
I have a "read and loved" bit where I tell them about my latest lovely read (sometimes I don't have anything lovely) or audiobook and ask about theirs. The key is that I never include anything written by anyone I know, so it's purely as a reader. This provides an avenue of engagement that isn't for gain, gets a lot of responses, and invests the VIP list in what we're all doing.
I also include snippets of things, cutting room floor stuff, images of my latest paintings done from book scenes. (Or their eyeballs! I was trying to learn how to do super-realistic eyes, so I did a painting of a reader's eyeball! I got loads of pics of eyeballs!) I don't have to write original fiction for them every week to get them to stay with me, though I'm also generous with that.
Approach your mailing list as the ultimate tool of the self-publisher. It releases you from depending so much on others for a good launch. It gives you more control over your destiny. That makes it important and valuable, but the people behind those numbers are the true treasure, so cultivate that.