There's one at my YC .. hasn't been in the water in 5 - 7 yrs from what I've been told. Shame. cool looking boat. Twin rudders, BIG out board. water ballast model I believe.
There are many boats of every type that sit for extended periods without being dropped in the water or taken out of the slip. It is a shame. Mac's are a cool little boat imho, will do a little bit of everything.