The market value of the boat is what you are paying for. All extras, options, equipment is what makes the deal better. I have purchased many used power boats and when looking for a specific model I know what the price range is. I look at boats based on standard equipment. If a specific boat model has a price range of say 200K to 225K and it is a 6 year old boat I know that I would pay 225K if I found that specific model boat that is in Bristol Condition and I would pay less if it was in need of some TLC. After a full evaluation of the boat I will access my offer price. This price is based on market value of the boat and has nothing to do with the equipment on board. Equipment can be added or removed. Factory options are expensive and are added to boats when new because the buyer requested them for their specific needs. In my opinion theses additional options have no value in price but have value in comparing apples to apples when purchasing a used boat.
Example: I'm looking for a Ranger R-29 2014. Boat (1) standard power 260 D4 Volvo, 650hrs on the engine, Generator has 400 hours, The owner has full maintenance records all matching the engine manufactures service recommendations, The hull and top sides are in good condition but need some TLC. A surveyor completes his/her report and the boat comes back with a Near Bristol Condition report. Boat needs fluff and buff and bottom job. All electronics are original, Marine air units are functional. There is no additional equipment, factory dinghy, cockpit helm, solar, ..... The boat is in real good condition and the owner is asking 180K.
Boat (2) Standard power with 350 hours, 20 hours on the generator, The boat has Cockpit helm, solar, factory dinghy set up (over 10K in options when the boat was new), original factory electronics, Random service records that show repairs done based on need not preventative maintenance, Hull and top sides need TLC, Surveyor report is average condition. The owner is asking 180K
Boat (3) Standard Power, D4 260 650 hours,Generator 400 hours, The owner has full maintenance records. Basically this boat matches up identical to Boat (1) Near Bristol Condition fluff and buff and a bottom job. The difference is it has solar, cockpit helm, and factory dinghy. The owner is asking 185K
Which one would I make the offer on? Boat (1) and (3) My offer would be the same for either boat. I would not pay more for Boat (3) because I am buying a boat not equipment. The equipment is a plus and makes the deal better but does not increase the value of the boat. If I really wanted that cockpit helm I may throw 1K extra but solar or a dinghy that is disposable equipment that personally I would want to be latest greatest technology. Any option is a owners desire to own. The insurance companies or banks don't look at those things as value and the value they put on them is 25cents on the dollar at best.
When you are purchasing a boat or a car used the bells and whistles are perks to the purchase but add little monetary value. When you go to trade a boat in. The salesman will ask what boat do you own. You answer, what condition is it in, You answer, What power plant does it have. You answer. At that point he/she knows what the trade in value is. Then he/she will ask what equipment does it have. You answer. The equipment additions will add very little if any more value. One exception (trailer will add 1K to 2K to the value.
When you buy a used boat buy the boat not the boats that has the equipment you want. You can always add the equipment and it will be new and have a warranty.
I have bought and sold many boats. A clean well maintained boat is worth a lot more than an average condition boat with equipment. A clean boat with all the bells and whistles is the boat you want but the Book Value is is not much different than the standard Equipped boat.
Good Luck with your search.