I guess the reason I find them more worrying is the lack of control. I know I can write good software, I think I've got a great product idea, and I know where I can get help in the areas I lack. These are all issues I can manage. Bruce Schneier writes a lot about how people fear things that are new, and things that are outside their control, this seems to apply.

The only way for me to "manage" some sort of patent lawsuit would be buying insurance against it (is that even possible?), and even then the insurance company would likely settle, handing over more cash, and further validating the business model.