The short answer is leveraged. Gps are a leveraged play on the MLPs. You can have the (hopefully) consistent income growth of the MLPs or lower income now and faster dividend growth with the GPs. Of course what the price per share does is anybody's guess as the GPs are getting pretty highly valued with the exception of MWP. To learn the concepts, go back on this board and MWP and read the posts by RRB1981. That will get you started.