You don't have to make people pay, when they click on "buy" or "prices" you just display a page that explains the project isn't ready, with a newsletter form. Search for "buffer MVP" to see a classic example of this.
The demo can be extremely simple, a sentence describing the concept and a (fake) screenshot.
Be aware that presenting the same product in different ways to different people lead to very different results, so you can run multiple tests like this to find the approach that has the better chances of working.
The demo can be extremely simple, a sentence describing the concept and a (fake) screenshot.
Be aware that presenting the same product in different ways to different people lead to very different results, so you can run multiple tests like this to find the approach that has the better chances of working.