Gibbs is world famous, and he's extremely famous in the future. Gibbs even said John Titor traveled back in time to purchase an hdr from him.Who's "everyone in the know"? People on this conspiracy site that we're currently on? If he actually could time travel, and provide people with a way in which to time travel, he would be world famous, and not needing to market his goods on his own site, and likely living in his mom's basement.
Just like all true pioneers in history, they're all ignored until long after they pass away. Little different for time travel pioneers, they can travel and get the acclaim they richly deserve right away. : )