Collecting every car from Forza Horizon 4's vast roster is no easy feat, as some vehicles are extremely rare and difficult to obtain. Fortunately, the game offers options to offload unneeded cars from the player's collection, with the Auction House being one of the best methods. Prices for certain cars can soar to an astounding 20 million credits, so for many players, holding onto such valuable vehicles may not be the best strategy. Since Auction House prices fluctuate based on demand and rarity, it's wise to monitor the market and avoid selling cars too cheaply to maximize one's profits.