Listing some of the reasons that quickly come to mind about why I might cbet the flop...

1. Disguise value bets and semibluffs
2. Villain will likely fold a better hand (read, often goes with scary board)

And not much else. But what about this reason?

3. Defensive. 3bet first, because Hero has garbage but it's pretty likely Villain does, too.

Example might be a blind battle with a LAGGy maniac player. Hero 3bets the LAGG (who blind steals 90% of the time from the BTN) pre, gets called, and there's a dry board on the flop. Hero checks HUD and sees cbet% is 80%. Hero cbets first, knowing if he checks Villain will cbet with ATC.

I guess my question is, does any one else find themselves 3betting to "bluff first" against players who seem to cbet nearly 100%?