How come there are so many errors on the Experts-Exchange home page when I validate?

Using FF Web Developer I noticed there are 855 errors on the Experts Exchange homepage when I validate the CSS. Also I noticed a lot of Joomla Web sites have many errors when the CSS is validated on those sites. Is this unprofessional?
iamdiggnifiedAsked:
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SSupremeConnect With a Mentor Commented:
I found 96 Errors, anyway yes it is unprofessional. It's just time consuming to research and correct all misc errors, some of them you need to rewrite id on class for example, basically it's unprofessional because it's require extra funds and work. I guess you can help EE website with that, as volunteer.
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