Yes engagement is key IMO. Doing well on these sites as far as upvotes goes, is maybe around 3$. We know that represents a lot of money behind the vote power, so. But compare that to engagement, that 3$ is nothing! I myself would rater make a few pennys, and get lots of comments when I post. Sure the money part is nice, but lets be real, for most of us we would have to post at least a 100 times a week for that to amount to something sustainable.