I think it's safe to say that for most businesses, while PayPal may only get you access to 80% of potential customers, Bitcoin gets you less than 1%.

Until Bitcoin is an established process, offering it means that you have to evangelize it. That means you are suddenly in the position of trying to sell both a service and a currency to a customer. That's more risk than most merchants want to take.

I did consider using it, I have a business with a fairly technical audience, but for now, I have to wait until the legal issues (whether only perceived or actually true) are worked out.