In any game of more than 2 players, there's a third element: strategy. That's a mix of both. People are pursuing their own interests and sometimes it affects other players disproportionately. Or, we might be sitting together at a 3-player game and I win, even though you're a better player, because that 3rd player is either lousy or unpredictable and does things that hand me advantages. (The most extreme example of this is the "king-maker scenario" where a player can't win but gets to choose the winner.) Puerto Rico, although very skillful and deep, is notorious for its table-position effect.
For an aside, part of what makes German-style board games is this strategic "interaction term" resulting neither from chance nor from individual skill alone. Pure skill games like Chess are a bit dry, in the sense that if the skill levels are different by much, the outcome is predictable: the more skillful player will win pretty much every time. German-style games leverage this third "strategic" factor to make games that aren't very luck-driven (you never feel "screwed by the dice") but that also don't have the same winner every time.
This is why most of the "serious" mind-sport games are two-party games. In Chess, if your opponent's strategy hurts you, then he (by definition) had a better strategy and therefore played more skillfully. In Bridge, any player's strategic affect on your outcome is likewise indicative: if your teammate hurt you through a strategic interaction, then you're not as good a team. In luckless 2-player games, the party that wins is the party that played better. In 3+ player games, this isn't always true.
Economic and business games are like that. They're massively multiplayer, which means that there are a lot of strategic-interaction teams that can't be attributed to skill or luck, and the quality of information most people have isn't very high. This is especially true in technology where, by definition, we're trying to do things that haven't been done before. That makes it fun, but also really, really noisy.