It does happen - especially with niche vehicles such as convertibles where good used examples can command a higher value during the summer months when demand will be higher than during the winter months. WBAC will probably be using ‘official’ motor trade sources such a CAP or Glass’s
Guide for the basis of their offer prices, and then the algorithm that ‘sits’ behind their website will adjust the CAP / Glass’s
Guide prices, for things such as mileage, service history, condition, etc, etc.
Factors such as supply and demand, seasonality, shortage of good examples of particular models will all influence the value.
Don’t be surprised though with WBAC if they offer a
lower price when they see the vehicle. They’re very good at reducing their initially indicated buying price if they find any for small stone chips, scuffs or scratches they find - they consider these to be damage rather than just normal wear and tear, as a friend of mine discovered.
WBAC website used to have the provision on their website to disclose any minor ‘damage’ when you ask them to provide an indicative price that they’ll pay for your car. I don’t know if the still have this but if they do, it’s important to be as honest as possible over a car’s condition and disclose even very minor imperfections, so you don’t give them any excuses for subsequently reducing their initial offer price.
