Beeryboats: I went thru this last year and had your same situation. With the sale of each RT, I would record the year, mileage, RT model, and most importantly, the final selling price. This took me a couple of months, but meanwhile I was saving my nickels and dimes, set-up a separate bank account for my "Mad-Motorcycle-money" and began putting in any "spare money" like there is such a thing into the pot.
Long story short, after about 3 months, I had accumulated about RT sales, ranging from thru By averaging the selling prices by year and mileage, I had pretty good idea of what an RT was worth.
Then I could make "quality judgements" like this RT has lower mileage or that RT has more add-on featiures.
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