MobClix has big promises as to eCPM, but in the past month, AdMob has been KILLING my MobClix performance. I have AdMob AND MobClix in place, and recently dialed it to send 80% of my impressions to AdMob because of >$1 eCPM from AdMob.

Also, be sure you HAVE a paid version with no ads available to buy -- and don't forget to cross promote it using house ads. I have about a 1.4% conversion rate to paid (at $2), which accounts for more income than the free version so far.

Granted I'm still not getting rich on my Android version, but I'm trying to get a publisher for it (ONE clause left in the contract still to iron out), which should help a lot.