What is the benefit of using original copy of Windows 7? [closed]

"You are not breaking the law...
You are guaranteed an original copy and no backdoors that may be present in illegal copies. (Not saying all have it).
Apart from that, there isn't really anything technical...
Direct from Microsoft-
Why you should care that your computer is running genuine Windows
In today’s world, you rely on your computer to work for you and to run your business. You store thousands of photos, music collections, and important documents; you make purchases, enter personal information, and search the Web. Imagine what it would be like to lose all your favorite family photos, or have your financial data stolen as a result of malicious or unwanted software running on your computer. Market research firm IDC reported in a recent study (English only) that obtaining and using pirated software can pose a serious security threat to organizations and individuals. Often, counterfeit software is bundled with malicious and unwanted software that can lead to a corrupted system, a loss of data, and even identity theft. The risk of running counterfeit software is real. Windows is the operating system and the brain behind everything you do on your computer; you can help protect your data by installing only genuine Windows."

"I suppose you mean the RTM version with ""original copy""?
The biggest benefit is that is won't expire somewhere beginning 2010 (as opposed to the RC version)."