The PureVert has been around since at least 2002...my Calbria ProV had the system. It worked great for adding that 1000ish lbs. I still, however, needed to add 600lb sack to my walkthru to optimize the wake. The shortcoming is twofold:
1) most hull designs start to sweep upwards from the helm forward, making it difficult to get enough weight forward to balance the boat when loaded. i am guessing you need a "cab forward" design (i.e. small bow) moving the helm and extra weight forward like I had on my ProV (which I liked...the bow is useless for how I use my boats). I could be wrong...I often am.
2) the "plug and play" systems that allow the piggy backing of sacks on top of pump filled tanks is a huge benefit for those of us that add additional weight. on my pump filled system I have 2150lbs of bags that fill on top of the factory 1000lbs with the flip of a switch and the enjoyment of a beverage. no additional work needed.
For the $600 in 3 Jabsco pumps, $500 in sacks, $300 in fittings/hoses/switches (all retail), MB would be brilliant to offer a "slammed" option of the aforementioned parts for that $1500...it may shift some market share, and since they pay wholesale, there would be a profit to be made....