If you don't want to pay simply because you can copy it, you are engaging in theft- it's no different than any other good in the marketplace.Wrong. It _is_ different, because patent law is not property law. Perhaps you are arguing that ideas _should_ be no different than any other physical good in the marketplace, but not spreading misconceptions while presenting your opinion would be preferable.
Also, consider the possibility that the same process was independently developed. Is it still "theft"? It doesn't map as easily onto property law now, does it? Yet independently developing a process which happens to be covered by a patent is still a breach of patent law.