Some posts are deleted because they contain a quoted post which was deleted. If there's a conversation that contains deleted content, the entire thing will be scrapped to ensure nobody can read content that has been deleted.
Also important to remember sometimes posters will delete their own posts! It's not always us. As TT said, we all have jobs and lives and real-world commitments to deal with, so although we attempt to cover the board for as wide a time range as possible, there is always the chance we'll all be offline simultaneously and log back on to hell on Earth.
Also people keep forgetting that
The Filth Wizard is a mod as well. You have to include him, or else we end up dealing with his breakdowns at the food court at Chadstone and everyone knows how embarrassing that is.