Why do you donate to crowdfinding? For a credit? other perk? karma?

I've been doing some research into crowdfunding and trying to understand how to motivate people to support a campaign.

With my own (indiegogo campaign), so far it's only been my family to donate so I'm trying to learn from it and fund out how to reach a wider audience.

Are you bothered about getting a credit?
Or do you just like being a part of bringing a film into the world?
Are there other perks that could persuade you?

This is my campaign which I started, to raise funds for a film festival run, but I think perhaps because the film is already made it doesn't give people as much incentive to donate.

www.indiegogo.com/projects/little-short-...

I'd love any feedback or to hear about what makes you decide to support a film.

Happy new year - May the gods clear your path for smooth yet adventurous productions!