I don't know if Hub Karma generates any earnings directly, but I do find that you create better bonds with other writers--ultimately increasing your hub views. Hub Karma is determined by how much you link to other writers' hubs. You can find related hubs by publishing your hub and viewing it. At the top of your hub, there will be a green button called "Suggest Links." Click on that and highlight key words within your hub that may prompt further reading. (Highlight up to six words in order to see a black window pop up that shows a list of articles with those words.) You can preview the other hubs by scrolling over them. To link the phrase you highlighted, just click on the green + sign next to that hub. Unfortunately, I do not know what a good hub karma score is...I'm new here, but I would love to hear what others say.