Not tried it but gut reaction is it shouldn’t harm and might well help.
The obvious answer is split test if you’ve got enough traffic going to the pages but next best would be track it over a period of time – depending on how you’re displaying the optin form and which autoresponder company you use, you may have some stats in there so you’d be able to compare roughly the same number of impressions over time.
Thanks. I think I’m gonna do it. I’m not to the point of split testing yet. I’m still building the content so ppl don’t see/hear crickets when they come to the site. BTW, I now see why Sean says we should begin building our expert presence even before we start driving traffic. I wish I’d been doing that all along on this site.