Disk Utility of Mac OS X 10.6

Everyone seems to say Mac OS X is user-friendly and you need not go through pages of user's manual. Most of the case, yes; but sometimes it isn't. Just now I'm trying to duplicate a non-copyrighted DVD. I opened Disk Utility, choosed File > New > "Disk Image from Folder...". So far so good. Then I created a disk image, burned it, and put the duplicate in a DVD player. It didn't play the DVD. What's wrong? I went to Apple's support page. Here is the answer: You need to choose "DVD/CD Master" before you click "Create" to create the image. Why shouldn't there be a prompt, such that I wouldn't waste my time to burn a few unreadable DVD before I learned of my mistake? Is this because Steve Job wants to discourage pirating? But my DVD is just my friends' non-copyrighted home movie!