The 5 year boat value formula

In money of the day , my boat cost £88k new, I bought her for £32k in 2016 and now I’m getting no interest in her at £26 k.

In 2026 money, my boat cost £237k new, I bought her for £44k in 2016 and am now getting no interest in her at £26k.

I feel better ignoring inflation.
 
I would guess that with even reasonable maintenance, the nature of brokerage and comps, for the first 5 years depreciation would be predictable. I don't know, because I've never looked at boats that young. But like a car, there isn't that much to do for the first 5-7 years.

At about that point it quickly devolves to:
  • Condition
  • Demand
The first is obvious. Age counts, no matter the degree of care. Some systems just age. But care counts for a very great deal.

The second is subtle. Some models hold value. Some are so common, not so much. I have found that, as a rule, if you buy a good boat, of a model that is in demand, you will pay more AND you will get it back when your sell (less your upkeep costs and the time value of money). If you buy a boat that is cheap, even in good condition, because it is less popular, you may have trouble selling.

Just my expereince. I have owned 4 multihulls and sold ach, after 10-15 years, for 0-10% more than I paid. I lost inflation and costs, but none of these were project boats. They just required upkeep. I'm seeing the same price trend with my current boat, which is still in demand (Corsair F-24).
 
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