Great commercial idea, haha! I emailed Coinbase to see if they have plans and/or how long to add Steem, so that users can do direct USD/Steem transactions ever - esp for Shift card use. Changelly told me they're working on cc/debit purchases direct to Steem as well. It'll be awhile to get my card in the mail but I hope to post a "smart way" article in the next day or two, and then will photo and blog some purchases as I go to keep people up on the results. Thanks again!
Best, Guy