No not cheaper, you could drown, get eaten by sharks and no way could
you do 500k in 4-5 hours. And really....what do you do if the wind
stops? hahaaaaaaaaaa. Couldn't resist that one, get it? In a glider
you just glide, in a sailboat you gotta start the motor, what if the
motor wont start? You'll be screwed matie.