No doubt old aluminum boats are bringing more money than old fiberglass boats. I'm just saying check your local market or references as to the value of what ever boat you're trying to sell. Different locales usually have different values.
Example: Growing up in CT I was keen on keeping up with used car prices. When I moved here to NH that went out the window. In CT high mileage work trucks sold kind of on the cheap side, lower KBB values. Here in NH if it has 4 wheels it's game on for top dollar. People actually sell and buy the trucks with cracked or rotted frames, no floor pans, serious body rot, motor doesn't run, etc... And forget about KBB values. None of those rigs would even be on the market in CT, they'd be at the scrap yard.
I started 2 years ago checking used boat prices because I needed to save up money to get one. In the beginning motor boats (kind of like mine) were expensive. You couldn't find anything under $1,500. for an old boat that needed serious work. I was originally looking for a small row boat with a small motor and trailer. Within a year those setups jumped from $600. to over $1,500. I just about gave up looking for a fishing rig. Then I spotted my fixer upper and got it for $400. Sure I have to rebuild the deck and transom but I'm game for it. I couldn't buy the motor or trailer alone for that price around here. Not that I plan to but after I fix it up I could sell it and make my money back. Sure the age/year of the rig plays a part in pricing, but around here if it's in really good condition they sell for decent money. At my somewhat local marina you can't touch anything for under $6,000. and they need some work too.
Example:
https://www.facebook.com/marketplac...wse_serp:2fff2cf1-aff2-4f9f-9aea-025246ec92ca