Although the BlackBerry app store may be missing a favorite app or ten, according to a report from Evans Data Corp., developers are still making money by creating apps for the OS. Although the survey feels a bit narrow in scope (just 400 working developers were polled), 13 percent of 'Berry devs said they make $100,000 or more per app -- which according to the data collectors -- is "considerably more than Android or iOS developers." So why isn't everyone dropping what they're doing to develop for RIM's OS? The problems seemed to outweigh the allure of cold, hard cash. 37 percent said app visibility was the biggest issue with