Google Gripe #6 - Gmail - Select All only Selects the Page Your Are on

The Select All button at the bottom only selects all from the page you are on. But if you truly want to select all, it should allow you to select ALL of your emails, not just by page. I have over 21% of my Gmail full. It would take hours to delete all my emails. I know that Google is working hard to monetize its free services and the best way to do this is to collect personal content from us all. I'm totally fine with that (one of the few, it seems, that is willing to give up my personal information for free services in hopes of getting some targeted content sent to me), but I still think there should be a way to check all of your emails at once and do various tasks (delete all, label all, etc.)