A lot of 1 oz to 10 oz gold bars are sold in sealed "assay card" holders, basically a plastic blister pack. Coins and most rounds, on the other hand, are typically sold bare, or in tubes. Premiums on coins are generally higher than bars, with or without assay cards.
Based on APMEX prices right now it appears that assay card gets you $10 more per ounce when you sell them back than the same bar without an assay card. The additional premium when you buy a bar in assay card versus not is often more than $10.
So there really doesn't appear to be a good reason to buy bars in assay card, as far as I can tell. So what is the point of an assay card? Is this just a marketing ploy?
If you buy small bars, do you like the ones in assay cards, or do you prefer to buy the naked bars? Why?