Numbers are a bit high (

), but I get your drift. The depreciation has been pretty harsh the last couple of years, something many fail to account for. I think if people just looked at a $3,600 a year figure, and not think of it monthly, it makes more sense by way of comparison.
My slip is $2,400, plus winterization, insurance, storage, payments, etc... So it easily tops $3,600 a year.
The one thing that would worry boaters is freedom and availability. Are boats available when they want one? With a great weekend like this one coming up, I'd imagine everyone would want to be out.
But it's a great concept, and has worked fairly well over the years. I wish you luck.