I'd add to this that if a newbie has more SP, he won't find himself as isolated as he will be if he keeps thinking "posting/looting" because there's nothing that drives people away more than plunderer.

A post's quality is a very subjective thing. You may think you've done the perfect post on pots and flower, but if your reader is a gamer who's the best definition of a flower is a collectible and definition of a pot is an inventory upgrade, then the quality of your post in his eyes will be definitely... low.

However, if you interact by upvoting his posts/commenting & bringing value to his own gaming posts, chances are he will take an interest in you despite the gaps.

That wouldn't happen with someone who has a low-end value as a viewer. For people to look at off-topic posts, it really has to bring them something important.