Imagine you are the boss of some kind of business that deals with physical objects everyday and why would you start to accept bitcoin payments?
What are you going to do with all that bitcoins that you've earned? Hold it? seriously?
There's many reasons why you should. It's cheaper than accepting creditcards and it's free promotion for your business for a start. If you don't want to hold the coins you can use a payment processor that gives you cash for them straight away so you're not risking anything.