I like the idea of d.maru being a goods making and plundering race. I`m not going to get into the exact modifiers right now, I just got home from work but I have three days off, so I will start messing around with income values comparative to other races soon.
Here are a couple ideas to further improve upon the goods making AND plundering concept.
Give Dark Marauders the ability to plunder anything, AND to make viral and regular clusters. This will allow dark marauders to pursue two income paths simultaneously. After all, I imagine that the idea of giving them the ability to make goods is to increase the number of goods available to the servers, but it would be bad to give them ONLY the option to make goods, since goods are not actually required. This would let them make industry clusters with regular clusters and plunder with viral clusters.