I don’t usually enjoy popping balloons, but there’s way too much hot air going around these days.  It’s time that somebody tells the truth about the current state of iPhone app advertising.  I hear too often from would-be iPhone app developers that making big bucks with ad supported apps is easy: Just stick in some $30 CPM ads, sit back, and watch the money roll in!

To understand why naive first-time developers have this mindset, you only have to turn to the figures being tossed out by the major iPhone ad networks.  Last summer, Admob was talking about $30 CPM brand ads and calling that “low end.”  Similarly, Medialets talks about their Dockers ads which paid in the $20-30 CPM range.  Even in today’s tough advertising market, Admob company continues to cite rather high “$12 to $14 average CPM” figures.

Ready for the brutal truth?  Most iPhone ads networks today pay around $0.50 CPM. In case you don’t know how to digest that statement, I’ve rewritten here in plain english: 1000 people have to look at your application’s ad just to earn you a measly 50 cents.  What about those $30 CPM figures?  They’re just marketing fluff.

If you want the truth, ask the folks on the front line: actual developers.  Bo Wang’s Galaxy Impact, an ad supported app with over 160,000 downloads, showed an eCPM (effective CPM) of $0.23.  App developer John Kelsey says he sees about $0.50 CPM. Pinch Media CEO Greg Yardley’s “appstore secrets” presentation reports a typical CPM range of 50c – $2 CPM (slide 24) and then in the comments section, Greg quotes developers saying ad rates had dropped to $0.38 CPM. Another developer running CPC ads says he sees $0.01-$0.03c / click.  The truth is that “Most Ad-Funded iPhone Apps Don’t Earn Enough To Buy A Sandwich”

Why the discrepancy?  Fill rate is partially responsible.  Even if a $30 CPM premium ad does exist, it’s not going to run in your app 100% of the time.  In fact, most of the time apps displays remnant (ie NOT premium) ad inventory.  As one developer says “NO ONE can maintain the fill rate at decent cpm”.

Additionally, every ad network wants to attract app developers bad.  Really bad.  So they pitch journalists with juicy stories of high CPMs and ‘case studies’ on developers making sick amounts of money.  Greystripe gets a press piece penned about an “iPhone Beer Pong App Making $7,000 A Month From Ads.”  Adwhirl gets Techcrunch to write “Just How Much Money Can Free iPhone Apps Make? Quite A Bit” which claims apps can make $5000 a day.  And Medialets highlights their $20-30 CPM Dockers ad.  These are the exceptions rather than the rules.  It’s marketing as usual.

The purpose of this post isn’t to point fingers at the ad networks or accuse anyone of lying.  I love ads and I love free apps.  And I love the entrepreneurial spirit in these impressive iPhone ad network companies.  But there’s an important message here for first-time app developers: if you’re considering quitting your cushy job to make $5,000 a day with a fart app, don’t do it.  Always run your back of the envelope calculations first, and don’t assume your app will get anything higher than a $0.50 CPM. Basing your assumptions on $30 CPMs will leave you high and dry.

As usual, readers, I love hearing your comments and questions.  So don’t be shy!