Live rock user here, always have being. Mainly because dry rock isn't available where I live and freight is a killer due to living in a regional area of Australia ( live rock is stocked at the lfs) Having to do critter control is slightly annoying tho. I still like to do a cycle with live rock incase of die off I gave my current tank about 2 weeks with no load just fed it to keep the bacteria happy and did weekly testing.

Where do the organisms come from? I already bought live sand, though I suppose I don't have to use it. If I don't then the question remains, where do the beneficial organisms come from? What am I missing? 

