[pbackup12345]

That actually makes a lot of sense. To be honest just as an idea that also means that "early adopters" could also mean "first customers at a super low price". Probably less people wants to try something untried, yet, then people want to try something super cheap that they actually need. Also then you can go to your real market and not the market of "beta testers" which will not necessarily give you the correct audience. So one way to gain your first 100 people is probably to actually SELL IT, but at an extreme discount to your real future audience. I even offered a lifetime free licence for the first 100 sign-ups who starts using it. (You loose little as they don't necessarily use it later but they do jump to the free business.) I did even had a few friends of mine post it on their Facebook as an "ad". That of course means that the product has to be at least partially viable.