Like you, I comment frequently but never really post content. I think reddit ruined it for me. In all my years of posting I only had one post with more than 9 points of positive karma and it wasn't even something amazing and unique - it was pictures of my dog in the BeforeNAfterAdoption sub. Small subs were welcoming but I didn't discover this till after years of posting to the defaults and getting immediately downvoted had taken all the fun out of it for me. I guess even though I viewed them frequently I didn't realize that the defaults were so cut throat.
Reddit has its way of ruining things. I'm a fan of competitive call of duty for some reason, it's just fun to watch, so I frequent that subreddit and the sub of the team I am a fan of. As you can imagine, the sub is full of younger kids that just downvote every opinion that is different than theirs. Other than those, I sometimes comment on Askreddit but even there people are downvote happy. It just gets eh, not too fun to contribute. I am enjoying Hubski more and feel like the community is a bit different.