I disagree... quite a bit. KSP is a single player game, and even with the eventual addition of a Multiplayer mode, I think everything about a game/save/solar system should only ever be effected by the handful of players currently playing on it. No grand online market or exchange, this is not an MMO. That being said, I do think it would be neat to see some ability to trade with other players in Multiplayer, it would allow for everything from serious trading between big space programs, to helping out players who are in a jam, or even the ability to sell craft designs to other players. That is all just an idea, and might be beyond the scope of the Dev's plans