Having a crowdfunding by a gambling site is not a good idea, its better to have a private investorss than making a crowdfund.
What kind of share you will give for a tester?
Even though investment is a game of probability, there is need for a very great and irresistible value proposition from a given project.
You know gambling is the highest of a risky business, combining it with crowd funding is not very suitable for investors unless the gain is very very great.