If gigamass was soooo useful to the Precursors that, like me, there can never be enough of it, why are there any dead worlds to be had? My and every civ I've encountered are busy reducing dead worlds to gigamass as fast as possible. At this rate, in less than a decade there won't be a single dead world to be found anywhere found anywhere in the galaxy.

If the answer is that the current dead worlds had NOT been dead worlds during the time of the time of the Precursors, that would suggest that dead worlds would be chock full of Precursor goodies. (Which players are NOT allowed to seek out because the ONLY things we can do with them is reduce them to gigamass, or possibly convert them to Class 1-5 planets.) Alternatively, MANY inhabitable worlds may have been rendered dead due to the numerous empire wars over the millennia after the Precursors. But if that was the case, once again that implies that those worth destroying during those wars, and therefore chock full of valuable loot to be gleaned from the wreckage. (Also, very few dead worlds are described as being war-wracked. In fact, I only recall such descriptions as being for still-inhabitable worlds.)