Of course a dealer will offer less than market value, they won't pay anywhere near what auction prices are. Did they see the bikes themselves or was their offer based on a phone call from someone they don't know offering up bikes they'd have to drive 100 miles to pick up and then find out if they ran?
Selling to a dealer will probably bring the least amount of money but may be the fastest/easiest sale
Selling to the general public might bring the most money, but may take a year to find the right guy.
If you want auction prices, sell it through an auction house at no reserve. You found the "as much as" price, what was the "as low as" price? Who knows which way the one you're trying to sell will fall on that day.
Selling to a dealer will probably bring the least amount of money but may be the fastest/easiest sale
Selling to the general public might bring the most money, but may take a year to find the right guy.
If you want auction prices, sell it through an auction house at no reserve. You found the "as much as" price, what was the "as low as" price? Who knows which way the one you're trying to sell will fall on that day.