I used to buy gold bullion as a sneaky way to get credit card points on the cheap (and then use them for first class flights around the world). You could usually do the trade profitably and quickly and quite safely with insured shipping via USPS. $50k at a time. It was a bit sketchy to have that much in bullion at home, and I quickly got bored of it. The things you do when you're young…
Who would you sell the bullion to to cash out?
One of the strangest financial anecdotes of my life. To this day I wonder what the vendor thought seeing a literal child buying bars of silver bullion, then selling them at a 25% markup later.