Apps store apart from any body's notice has been tremendously successful. Such a huge sucess that wasn't expected by apple itself.
In august apps store hit 1000000 apps on the apps store and in the august Steve jobs declared a billion download milestone
So What is that which has made apps store a huge success which has now started to pour more than $90 million a day into apple's pocket.
Consistently throughout the history apple has kept a closed system on all it's products form iMac to Ipad.
