Im way confused myself.
You bought the boat for 2500 it had no slip fee included
Youve had the boat for a couple of years and have had it sliped or moored for that time.
Your selling the boat want what you paid for it along with the remaining slip/mooring time left.
First boats are a money pit and i would never expect to get what i have in it back.
Oday 25 under my understanding is a trailer sailor i wouldnt be supprised if a new owner didnt even plan on keeping the boat in the same place and would see the slip as a monetary gain.
Personally if your done with the boat the economy sucks think of it this way if you dont sell while the weather is still nice and people are wishing they had a boat you might be paying for another slip fee for another year.
On a side note i pay an anual slip fee its a signed contract between myself and the marina. My boat did not sign the contract I did I could get a different boat and put it in the same spot. However I cant let someone else use the slip. No different than renting an apartment leaving it early and leting so eone else move in.