And they will ask you, what are the most popular and basic advantages of bitcoin when they are going to accept it? You can say that if they have customers offshore they can tell their customers to send their payments by means of bitcoin. And by that way, that is going to make their transactions fast and convenient.
Please tell me you're being sarcastic. Gone are the days when bitcoin has fast transactions and low fees. You're not going to buy 3$ worth of coffee and then spend 2 more dollars for the transaction fee in bitcoins. And even with this amount of transaction fee, you'd still have to wait a couple of hours before the transactions comes through. Plus, it's not convenient since the store owner has to wait before he can ever get those coins. We're still not at the point when a store looks cool when it says "Bitcoin accepted here." since we're so far away from mass adoption.
Fiat is still the best when it comes to microtransactions. No transaction fee. Instant confirmations. That's fiat for you.
Still it is cheaper for the business to accept BTC fees-wise, since they pay 3 to 5% to credit card companies for the "privilege" to use their service - putting 400+ satoshi/B is far cheaper. Oh, did I mention they also need to buy the credit card machines?