Does anyone here pause their high volume campaigns every so often for a day or two so that spying tools don't tag them with high "days seen" scores? You could temporarily swap them out with other slightly worse performers for that time.
instead of focusing on hiding them, I focus on killing the crap out of them and on to the next one, so copycatters always get lost in the dust.. 
^^ Exactly what blackberry said. Instead of pausing your volume. Go BIGGGGGG if need be use a couple more accounts running the same shit and get back what your effort's worth before someone start copying your stuff
I've learned to accept it as part of the game at this point. Ignore the folks that decide to copy your creatives and just focus on churning out others. I personally don't give much of a shit if someone takes my creatives because I know they will have a very difficult time finding the offer I'm promoting or getting anywhere close to the payout I am on the offers.
At the end of the day I know that those people are not my true competition and will barely put a dent in my campaigns. The marketers that I know that can affect my campaigns are those that put out their own unique creatives.
What bothers me the most is all my good ads are almost ALWAYS disapproved 2-3 weeks later after an approval. I can only assume the ad was copied at this point. Am i correct to assume that?
never assume, just test.. if the CTR sucks, then just move on to the next one