How important is it for pages to validate?

[Cleo]

I've got my pages to validate except for these few items that I don't want to fix.

http://www.greenguysboard.com/board/attachment.php?attachmentid=2376&stc=1&d=1378478874

Question is does it really matter?

[Greenguy]

Validate where?

I used to care about that stuff, until I fixed up 1 page PERFECTLY for one place, then checked it at another & found about 20 errors based on their validation process |banghead|

[Cleo]

Validate where?
It's built into Dreamweaver. It sends your pages code to the W3C Validation service and reports back.

If nothing else it has found all my coding errors in my pages.

Here is one of the pages that validates except for the few errors that I posted about.
http://cleoerotica.com/tranny/foxyangel/melanie_robby_action/preview/