This makes me think that perhaps the click-happy ppl who just liked my ad pictures have grown tired of them and have simply stopped clicking, but a profitable target demographic still remains - clicking less and converting more. With such a low CTR, each click is more likely to convert.
Keep in mind that sometimes my strategy is to squeeze a camp for everything it's worth as quickly as possible and move on (like the aliens from indendence day), so while its quite profitable now, i know that this campaign will likely be relatively short-lived. Still, I might be able to milk it for $50 - $100 profit/day for weeks or even months to come. The point? Don't get too fixated on your stats like CTR, EPC, clicks, CPC and even ROI, and remain focused on your NET PROFIT, because ultimately thats what really matters. Happy affiliating!