That's not really a kickstarter so much as a gofundme for a business. $50 for a stress ball? $1000 for a ride in NYC? Kickstarter rewards ought to be close to the value that you're giving, because it's analogous to an investment. Kickstarter is not a charity fundraiser.
Why not give credits as a reward? You're raising capital for a business, so theoretically you should be profitable enough to pay back investors. And if not, there are no rides because there are no drivers.