Team Size of EBay's Android & iPhone App: 100 Each

This is classic evidence as to why it's extremely difficult to estimate the cost and effort involved in building mobile apps. EBay has 100 staff on the Android version of ONE app, and another 100 staff on the iPhone version of the same ONE app. Two apps with the same list of features can take drastically different amount of time and effort to build, the difference being the level of polish and how much it's perfected vs just churning out a bunch of features.

Reference: http://www.asiaone.com/News/Latest%2BNews/Science%2Band%2BTech/Story/A1Story20111217-316737.html