Yachting in Australia divedies into two major categories
http://www.yachting.org.au
recreational and sportive.
Recreational sector is dominated by a bigger vehicles with diesel or oil
propulsion. Sportive yachting is also big and is dominated by sail
powered vehicles.
Sportive yachting is government endorsed sport.
Australia pops up first in google seach insight for request "yacht"
Search at
http://www.boatpoint.com.au reveals 18024 diesel boat offers
and 3112 sail boats offers
http://www.yachtandboat.com.au says 5554 for diesel boats, 1870 for sail
http://www.boatsonline.com.au 7418
http://www.tradingpost.com.au 4324
