I'd like to point out - in a sort of FYI fashion - that there exist people who will NOT buy a game on Steam (or Nutaku) even if it is offered for free, because of their DRM; people who came to itch.io and other similar places exactly and specifically to get away from that. So make of it what you will. But I will also point out that I have never ever paid money for a mere demo - and I'm not about to start now.