Yep, cpm seems to be decreasing for me too. Soon it will be time to switch to another alternative ad network.
Yeah, they are slowly going down and they don't have 100% fill rate either. In few days or weeks they gonna have like 1 cent per cpm.
I used Smowtion for a few days and it was kinda average, i dunno. Maybe better than other alt ad networks. I'm quite fond of Smowtion, probably because of their ads and dashboard.etc.
By the way I submitted my site for review like few weeks ago and it still pending, lol. Its been like 4 weeks now, lol.
not worth the effort, i tried it before and still stick with adsense because their rates is nothing to shout about.