Always welcome these kind of projects. However, unless you re ready to spend massive amount of money on advertising, this is not going to work. There re too many similar websites and projects and in order to have visitors, you need to advertise. A lot.
Definitely - To get active users with ideas coming to the site there also needs to be incentives or such to choose you. You have a good twitter with a good amount of followers what is your plan on advertising.
Do you think you have benefits over Kicktarter/Indiegogo (Besides accepting a range of cryptocurrencies)?