Why app developers need marketing agencies' help?

EVERY DEVELOPER THINKS THEIR APP IS GOING TO BE AN INSTANT HIT REALITY CHECK: 1.3MILLION OF MOBILE APPS 650,000 APPS ON THE APP STORE ALONE 40 MILLION # OF APPS DOWNLOADED FROM APP STORES DAILY LESS THAN 1% OF APPS ARE DISCOVERED BY THE APP STORE SHOPPERS TOP 100 22 # of apps an average American smartphone user owns AS AWESOME AS YOUR APP MIGHT BE, THE ODDS ARE STACKED AGAINST YOU. DON'T WAIT FOR A MIRACLE GET YOUR APP DISCOVERED & GIVE IT THE ATTENTION IT DESERVES! (omboApp Promoting the Digital Wave