Kickstarter is the one. Thanks.
Then your understanding of kickstarter is almost completely OFF THE MARK.
I remember hearing about a website in which wealthy people browse the posted business plans of various entrepreneurs, and, if those wealthy people choose, contribute startup cash to any of these ideas.
The website I remember hearing about involved the donation of cash by these wealthy people without commitment or expectation of cash return on their investment, donations simply motivated by the merit of the ideas.
One: It's actually not an investment site. At least not in a traditional sense.
Two: It's not a investment site aimed at WEALTHY persons. It's actually marketed to regular people who want to fund budding entrepreneurs as well as self-publishing artists, writers, and self-producing filmmakers.
Three: If the project needs $50,000 raised in two months yet fails to raise that amount in that time then the money already pledged by the person's pledging that money don't even get charged for their pledge. They don't lose any money at all.
Four: For the most part, if the project gets 100+% of the funding then most of the people pledging into the fund actually pledge at a certain level where they actually end up buying a product produced by the project funding. Ex.: Pledging at the $25 level gets the person a single copy of the movie produced with the funds. Pledging at the $50 gets the person a single copy of the movie and a poster of said movie. Pledging $1000 gets the person all of the above and a producers credit. Etc....
Most kickstarter options are really cheap entry points and thusly are not aimed at millionaires and billionaires who if they really wanted to invest in a particular project of these small sizes could do so in a single bidding.