There is a reason behind that. If you purchase something on Amazon and that the product is on the logistic side, you can’t stop the delivery. if you purchase a good on other Indiegogo campaign, you can’t even ask for a refund. Some other campaigners are even refunding 6 months or 1 year after. If you purchase a good on Internet, some companies won’t allow you even to modify anything after you clicked on PURCHASE.