The hardest thing for you will be to believe customers that win will be 100% fair. 30 percent is a lot too, really a lot. There were similar websites here but they got closed because had lack of people. As you see idea is simple to release and since it's not (or rarely is) on market, this means there is no demand. You can see what others will post but I doubt anyone will suggest you to release your idea.
thanks!
what IF I reduce my% to 10% is this is More Fair?
its Good to Think Not twice but 10 times b4 action.
any suggestions I really appreciate!!