The way it works now doesn't always work as the directions indicate. I've used the 'gift' functionality with Humble Bundle before and it worked but it has recently changed with their new store and process. I attempted to gift an item to my son's email and it was never received by him and I was unable to redeem it again after that. It was lost in limbo.
So, this isn't just an issue with people not reading directions, there ARE issues with how the gifting feature from Humble Bundle is working. Yes, this is a simplistic walk through to help for those not knowing, but it also outlines that there are a lot of quirks with the new process.