Usually, when transporting a new hull over the water (at least here in Holland), it is placed on top of a barge, then towed. Then again, the distances are a lot shorter. In commercial shipbuilding it is quite common to tow a hull from Poland or Romania to Holland.
Cutting corners here and there might give you a low estimate for the total cost in the beginning, but you will probably end up with a yacht which costs about the same amount of money (or more) in the end. In the process, you'll have lost some hair as well.
I find that all superyacht owners are avidly looking for the best value for money, but for some reason newcomers are a lot more inclined to take risks than experienced yacht owners.
But now I am basing theories on a number which showed up somewhere which may be totally unreliable. Reminds me a bit of the Fox News coverage of the 200 Million $/day trip to Asia of Barack Obama.