I don’t have a good answer as to why the $9 spread between selling and buying from the coin shops. Is it theft? Probably, or it’s just what the market allows them to get away with and I’d have to think it has to do with a thin supply.
Every business does the same thing. When the I-phone had massive demand a few years ago Apple charged over $1K a phone. When demand leveled off, they couldn’t get so much.
I don’t have a problem with the spreads in silver, but that’s because I’ve been holding for years at lower prices. If I want to capture the spread, I can always sell on Ebay and pay their 3% fee or whatever it is now. It’s a little more work but I get alot more. I did that back when silver was $40 and did quite well – never got stiffed.