Actually, in this day and age of potential lawsuits, perhaps you should get incorporated. But, clearly, this is a decision for you and your CPA to make. Your circumstances suggest that you are clearly in a risky business and so the question in my mind is whether or not you should be an S corporation vs an LLC.
From your business and circumstances that you have mentioned, maybe an LLC is the right answer and is easier to operate and you would enjoy the same legal protection. The S corporation is a rather complicated entity and the tax law will eventually move to neutralize the benefit from not subjecting the pass-through income to Self-Employment taxes.
Also, in most states the LLC can be easily be dissolved, has low minimum franchise or state corporation taxes and is more flexible to operate.
Please also consider reviewing the following link for a more detailed discussion on the advantages of an LLC vs an S Corporation.
http://www.asktaxguru.com/227-benefi...porations.html