Figuring a slot cars worth can be difficult, but it comes down to what a person’s willing to pay. The seller many times believes he/she is in control. Reality is the purchaser is in control. A car that is considered over priced will not sale.
Older cars that aren’t highly available can generate higher amounts. Only due to a purchaser wanting something unique. Purchasers can’t decide to go and buy it somewhere else; thus giving the seller some leverage.
Sellers should research other sellers listings to get an idea of what cars are going for. Don’t assume a car can be sold for $100 because it’s old. Determine a fair price for both you (as the seller) and the buyer.