In my opinion, if you are a merchant looking to support bitcoin adoption, your first task is to build a sustainable business, even if it means accepting fiat. That means building a product that people actually want to use. Make sure you have a good product and that you can cover your expenses and be sustainable.

Alongside that, you will accept bitcoin, and you should accept bitcoin at a lower fare than you accept fiat. If your business is sustainable, you should be able to do that. Bitcoin provides some benefits to merchants, including 1) lower transaction fees than credit cards; and 2) no chargebacks from customers. These reasons alone should be enough to let you lower the rate on bitcoin purchases.