Just because the value fluctuates, doesn't make it any less of a type of currency. If you want to see examples of companies using SBD, look at @Privex, they accept SBD and STEEM. Not that I'm trying to tell you how to run your business or anything. The community benefits from a free market, and companies should adapt to that, not the other way around. At least, the company that's more likely to get my business that is.