That's $22K USD for the product (seakeeper 2). The install is over top of that and would not be cheap (although would be much cheaper for new builds I would think). They are also coming out with a seakeeper 1 for even small boats (around 25' or so) next year I believe.
The biggest benefit I see with this product is that it helps reduce the every present tradeoff of "Smooth Ride VS Stability" that every boat owner deals with. Those nice chop cutting hulls typically have more roll issues due to deeper V, etc. whereas those chop slappling boats are generally much more stable while trolling/at anchor. By adding a seakeeper to a deeper V nice riding hull you could really cut back on the side to side roll and have the best of both worlds... in theory... and for $30,000+