I know you decided against selling this as a SaaS but please reconsider. That you are self-hostable is a selling point that will drive potential hosted customers to you.
It's the same story with Gitlab: I love that it's open source and self-hostable. I prefer they take care of the hosting for me, but it's good to know if they go under, I can switch to the self-hosted version and there will be very few workflow changes for my team.
I will be considering it, you are right. Some people just don't want to bother with the technical stuff that comes with managing servers and/or installing the software. I'll definitively consider a SaaS version.
Thanks!
Also, I'm not in the market for this right now but I keep a list of products I've seen and liked. The need to sign up for your demo stopped me looking at it. Consider if you can remove that crucial barrier to people seeing your app. Something like read only, a preset user, or generate an account automatically with a disposible email address.