Where else would they be though? Why not be here with the potential to earn something for their efforts?
Anyone who owns a blog at theirdomain.com will make nothing but advertising revenue if they really want to go that route... but the amount of ads one would need would probably do worse for the site than good..
Not to mention - you need the traffic in order to get approved for displaying ads at the best paying ad exchanges anyways...
At the very least, one should be cross-posting to STEEM anyways, a penny earned is a penny gained, use all available avenues to grow your network and reach.