Yes so far I am really am. It has been a great place to get feedback on my writing and to read new material from other very solid writers. I've definitely found a few new favorites who I read regularly. In addition, I've gained a lot of readers as well which is great.
As for earnings, hubs linked to my other websites and blogs and vice versa have resulted in traffic boosts all around. HP is kind of the best of both worlds in that it gives a sense of community and participation that is lacking in many other forums. It also is a good way, over time, to make a residual income while promoting other material.