Papermine isn't for brochures, only, though. You can create pretty much whatever you want with it.
For instance (and this was actually a problem I had after I got married), wedding albums to send to family and friends via email. I actually think photographers could use this a lot in general.
It's just a nicer format than a PDF (10 times nicer on a tablet, I'd say), and more interactive.
Compared to similar products, Papermine actually lets you create the content, and it's not merely an aggregator.
"Who could use this" and "who will pay enough for this to build a sustainable business" are two different questions. I was addressing the more important one.
Compared to other platforms we're more about the user using a editor to create the content himself, rather than doing that automatically (like—for instance—Paperly). There is an import tool, but normally you'd want to use Papermine as a content creation tool, rather than an aggregator.
As for CMS integrations, right now we're focusing on getting the basics right. However, we do want to make it easy to create great publications: if integrating with any CMSes people use will help with that, we will certainly do it :-)
You need something to prove it exists. Even screenshots sub-titled "Actual screen shot" would make it clear that something exists. You have limited time, so how you do it is up to you.
I'm Italian, my wife's American, I told her that I wanted to use 'less' so that I could do things like "95% less this, 95% less that", while "fewer" would limit my choice in that regard.
She said it's fine.
Does it sound really bad/that I don't know it should be "fewer" I guess..?
Without some proof that it works and that it's really as easy as you say, it's a much harder sell. Try testing it with and without the video and see how many signups you get. You can always do an email drip after you have their address, but you have to get them first! Is it worth losing some percentage of your leads?