This confusion over backing vs. buying isn't helped when Ali and Bob Roohparvar were both posting Updates saying:
"Only NN hours left to buy batterisers on Indiegogo!
It's the final stretch of our pre-sale, and we are thankful for all of your contributions!
In these few final days, don’t forget to refer your friends, and be rewarded with free Batterisers for every friend who buys. Just use the “link” icon on the left side of the IGG page and share with all your friends via e-mail or social media."
I'm no lawyer - but that looks pretty much like a rather specific
offer. While Indiegogo may have their basic model defined as a 'contributions' structure, it does not preclude a campaign from offering more concrete rewards. When you use a phrase like:
"Only NN hours left to buy batterisers on Indiegogo!", as I see it, the mechanism is no longer following the 'give your money and cross your fingers you'll get something', but a simple, unambiguous offer of goods for sale. When such an offer is accepted and money paid, as I understand it, that is a contract.
Offer - acceptance - consideration ... It's all there.