All,
Hundreds of boats are moved every year on conventional vessels. The key things to have are proper preparation, experienced crews and port captains, and a good insurance policy. Accidents obviously happen to even the best operations. We are involved on the logistics of many technical heavylift moves every year for the oil/gas exploration and international construction industries. Some of these are pieces weighing upwards of 500-1000 metric tons and you can imagine the value of the units.. We put our own heavylift engineers on site for the lifts and 99.999 percent of the time we have no problems.
But, things happen and even experienced operators do have problems:
http://www.cargolaw.com/2007nightmare_crane-yacht.html http://www.cargolaw.com/2007nightmare_jumbo_challe.html
Conventional vessels will and should continue to be a viable method for yacht transport.