From the Wargaming Addict blog (http://www.thewargamingaddict.com/the-history-of-tabletop-wargaming/)
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IIRC, Jane's started off as an attempt at creating a naval wargame of sorts, pre-WW2 ( or was it pre-WWI?). Supposedly they realized that people were taking interest in the warship info & stats contained therein and began creating the World Navies book series afterward. I thought it an interesting 'Chicken-or-the-egg' type of story but I haven't checked into the details or whether it was just rumor.