Trade-in values are based on several factors, including:

Current resale value
Condition
Completeness
Demand
How many we already have in stock
How quickly we expect the item to sell
Whether the item needs cleaning, testing, resurfacing, repair, or parts
Whether it includes the case, manual, artwork, cables, controllers, or accessories
Whether the item is authentic
Whether the item is damaged or heavily worn

A rare item in excellent condition may receive a stronger offer. A common item, damaged item, incomplete item, or item we already have a lot of may receive a lower offer.