A recurring discussion at NAB concerned whether it is getting harder to make money from selling content personalization and recommendations software? Some executives were adamant that this is a fledgling field with a long runway for innovation and riches in streaming media, while others approached this subject with more caution, when speaking with Faultline in Las Vegas last week. Clues to support an argument in either direction were dotted around the event. ContentWise, for instance, had all-but dissipated into obscurity with only a claustrophobic meeting box, located in the very back corner of the new West Hall, to show for its NAB presence. Others, like ThinkAnalytics and XroadMedia, continue to report relentless growth. We have previously voiced concerns about ContentWise…