The increase is my doing and something I'll talk about more later on in a site announcement; but the reason a post is deleted should be obvious to the poster and will either be because it is inappropriate or does not add anything to the discussion.
Having a conversation about every post that is deleted is simply not practical, however the best thing anyone can do to avoid a post being deleted is ensure it is on-topic, civil and dosen't address another member personally, but instead addresses
what they've said.
Cheers,
Shaun