Picture an entrepreneur that got an idea for a new fantastic mobile application, off course that person want to target all mobile platforms to archive the greater market place: Android, Symbian (J2ME/C++ whatever the tool), Blackberry, Windows Mobile/Phone 7 and the iPhone.
So the person might get individual quotes for each platform but because the iPhone is such a close environment the developers that can target that platform will off course charge much more for development so because development for all the other platforms are reasonable they might decide that its then not worth targeting the iPhone... Note that even if they do accept the quote there are still all the issues where Apple reject applications to the AppStore sometimes for every stupid bizarre reasons.