Our houseboat LLC works pretty much as described above.
One of our owners texted this to me today:
But I'm having my doubts and concerns about launching our houseboat with the current and projected water levels and (un)anticipated runoff. I hate to be a negative Nancy, but I'm trying to work with the reality of the situation, not against it.
FWIW, we just have a buoy, and we're paying for it all through the off-season because we've been told there's a waiting list and limited supply. We could lose our buoy altogether if we wanted to cancel it, and who knows if we could get one back each summer when we relaunch. Maybe that's just fear-tactic sales from Errormark

but it's a concern and extra cost of ownership.