Globally, OSM is a game-changer. The NavTeq Haiti had just four roads: out in the boonies, there's no money in doing it, so the commercial providers have no incentive. It's the same as your MTB trails: the number of people who care enough to pay for it are small, so the urge to produce maps is low unless the consumers can be the creators .
They're still thinking like Britannica, though: providing a dataset that's got slow turnaround and claims high trustworthiness. OSM's Wikipedia approach is, I'm convinced, a winner against both the trusted-data folks and the people in unprofitable niches.