I am looking at the offset from the incredible deals to be found on dock rates in our area. Marinas advertising $14 per foot two years ago are leasing at $9 per foot and waiving dock fees, etc. It's practically a ghost town around here. Three years ago most marinas in our area had wait lists up to 3 months. Today, they sit at around 50% occupied. Now private owner slips in Marina Associations are going for as little as $7 +/- per foot.
Example: Riviera Dunes - Palmetto, FL (privately owned 55' slip in highly desirable marina)
Pre-economic mayhem ($14 per foot) = $770 per month
Today ($7.27 per foot) = $400 per month plus one month free if you pay the year up front.
$370 per month still buys a good deal of diesel and more than offsets the periodic fuel price increases like we see now and we all experienced in 2008.
Of course, if you trailer your boat; I feel for you.