Using an auction service as a price guide requires finding completed sales, not the eternally relisted items with years of exposure. Much the same as a gun show exhibitor who has AR 15 parts in a glass case yet they are 50% higher than retail. No, they aren't selling, they are laughed at.
Watches knives firearms and vehicles, some price to move the merchandise, and the others seem to prefer displaying at museum prices, setting up show after show, or relisting over and over, sometimes for years, and none of it moves. It you have items worth $100 and you price them to sell, then it does, you put out another, and it sells again, you can make more in the same time period in cash flow than waiting for that one score. Retail learned that a long time ago. Do we not wait until the season ends to cherry pick what is now discounted to move along? Mowers in October, snow blowers in April.
Look for completed sales, those are actually records of transactions where both buyer and seller were in agreement with price. Someone's prized collectible rare and hard to find cartridge? Not when it's 3X the going rate of actual sold merchandise.