Originally Posted by carlkra
One of the main problems is the limitations of the Blackberry OS requirement that apps have to live in system memory even when they are not running. A 16GB iPhone can have tons of large apps all loaded into the 16 GB. A Blackberry Bold with an 8GB memory card and 1GB of device flash memory still has to have all of its apps loaded into the 128 MB of system RAM of which less than 50 MB is free on most Bolds.
That is the answer. And also the hurdle that any RIM app store will have to overcome.