Why do major websites not pass W3C validation properly?

In an attempt to understand if W3C validation can assist better DOM rendering or if it is just a standard for HTML coding, I tried to validate major websites but all of them fail with some errors. Here are typical examples: - google.com **36 Errors, 2 warning(s)** - facebook.com **42 Errors** - youtube.com **91 Errors, 3 warning(s)** - yahoo.com **212 Errors, 8 warning(s)** - amazon.com **510 Errors, 138 warning(s)** When major websites do not seem to spend enough time for W3C validation, is it needed to spend time to do so for small- and medium-sized websites?
I think this question actually contains two subjects (both of them interesting): 1) Do I need to generate valid HTML? 2) Why don't they do it?

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