Tangent: threads like this and the one a while back with the debate over what does a high-level Commoner look like remind me of why I like HERO so much.
Some of the skills developed playing some of these games would have direct combat applications, but tied to a class & level system, it's hard to see how an adventurer couldn't just come in and dominate at the fairs. For instance, I would bet that most participants in knife- or axe-throwing competitions (RW or RPG) never got into serious fights, so you probably wouldn't consider them "warriors" of any real sort, but their skills could prove deadly if turned to violent ends.
(Kind of like the Welsh hunters of a few hundred years ago...)
In D&D, though, it's hard to separate that level of accuracy with a deadly weapon from being a member of a warrior class...or having LOTS of Commoner levels.
In HERO, though, it's just skill levels. The knife-throwing Champion of the Shire could be an Average Joe who just happens to have great skill with knife throwing...enough to put a trained assassin to shame.