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My personal opinion, not speaking for anyone else:

A user-run community can't generally be _the_ support site for your game or other product, but it can be _a_ support site.  Your players can get answers here from other players, just like for other games, and if people posting answers (like you!) provide links or other sources, they might even get authoritative answers.

But just plain outsourcing your support to a community generally doesn't work.  First, if your game is new or obscure, the chances of somebody else being able to answer those questions aren't high.  And second, there are types of questions or problems that only you can address.  For example, bug reports obviously need to go to you, though questions about how to work around them could go to you or to a Q&A community.

Tabletop Games is a community of gamers and game designers helping each other.  You can best support your game here by being active in the community yourself.  Look out for questions about your game that you can answer -- and help guide the people who ask them if they're new.  Help them have a good experience.  Also look around for questions that are already here, and if you can improve existing answers, edit or comment -- you'll help lift up other people who can answer questions about your game this way.  Vote. 
While you're here, see if you can answer questions about _other_ games too and be part of the gamers-helping-gamers goal.