Honestly, having essentially run a game store for a couple years (the owner was more than happy to let me do pretty much everything from order his stock to run his events) I can attest to the difficulty of building a community and maintaining it's ability to be open and fun for new people. If you are running straight tournament style events all the time you will lose players if the top tier of people win all the prizes.
I used to play a lot of Magic and for a brief time was a strong enough player to have a store owner ask me not to come to his events because he was working really hard to build a community that wasn't win at all costs, so @heychadwick's comment about tournament players scaring off new people I think holds true for a lot of places and is something that people who are maintaining these communities keep tabs on.
On the original topic of the post: It isn't that FFG is not welcoming to new players, its that miniatures games in general are difficult and expensive to play and the learning curve is steep.