Crowdfunder is investment based, not rewards based. This site connects creators with many kinds of investors in order to raise equity.
Con Membership is expensive
No fees are applied to pledges because startups are required to pay $299/mo if they want to earn up to $500,000, or $999/mo to have unlimited access to investment. For small projects, this is expensive. However, other crowdfunding platforms charge around 5%, meaning that the fee applied $500,000 would be about $25,000 instead of $299.