Imagine a perfect world where websites are seen by everyone without browser's compatibility problems, accessibility restrictions and where your website is easily found by search engines. These are just a few promises of using the web standards. I think you should appreciate this:
Writing web pages in accordance with the standards shortens site development time and makes pages easier to maintain. Debugging and troubleshooting become easier, because the code follows a standard. Your site is accessible, compatible, easyly loaded. One version of your site and that is it.(The Web Standards Project - FAQ p211)