Improper Storage Keeping coins in humid or PVC containers can lead to corrosion and damage fast.
Over-Cleaning Scrubbing coins kills their value—collectors want natural patina, not shine.
Ignoring Authentication Failing to verify rare coins can leave you with fakes or overpaying for common pieces.
Mishandling Touching coins with bare hands leaves oils that damage surfaces over time
Not Tracking Market Trends Values shift—if you're not watching the market, you're probably underselling.
Skipping Appraisals Without a professional opinion, you might misjudge a coin's actual worth.
Hoarding Junk Coins Quantity doesn't equal quality—low-grade bulk coins rarely increase in value.