First, these rolls are put together by the sellers, so they know the value of the coins inside and set the price accordingly.
Second, if you believe that the seller really doesn't know that this is not a full roll of "Gem BU Carson City Minted Dollars with Proof-Like finishes", then why do you believe that the seller either a) would not open the roll and sell the coins individually or b) would sell the roll for way less than 20 times the value of the end coin?
No buyer is getting a bargain buying rolled coins with some rare or maybe rare (like a VDB wheat, or 1909
IHC, a CC Morgan) or a BU coin of any denomination, where the seller indicates that they do not know what the other coins in the roll may be (this is a LIE).
All you have to do is look at the feedback of these sellers. Some positive comments might be similar to - "not what I expected", "seller worked with me", or "graciously accepted return", etc. Neutral or negative comments might be similar to - "end coins only thing of value", "junk inside, won't accept return", or "misleading listing - not worth money", etc.
You can also look at the seller's sold listings to see the range of prices that similar rolls fetched.
The only people that would buy a roll of
Morgan dollars for more than $400-$500 where they can only see two reverses, or two obverses, or one of each, are those people that want to believe that the seller is not lying, that the seller is a fool, and/or that the roll must contain many more valuable coins inside.
Would you go into a coin store and tell the dealer, I'll give you $2,000 for a roll of
Morgan dollars. You pick the dollars and don't show me any of them except a single side of two different coins, and I will agree not to return them no matter what the other 18 coins you include? This is what these
ebay buyers are doing when they buy these rolls.
The following three rolls (seller's names and listing numbers not given) are selling you 20 silver dollars, where you can only see one side of two specific coins. They don't tell you anything about the condition or specific dates or mint marks of the other 18 coins and you can't see them. All three of these rolls are already bid up to around the $50 PER COIN range. Some sold listings indicate the final selling price is $90 - $100 per coin, basically sight unseen.
Reading the listings carefully, each seller tells you that not all the coins in the roll are like the end coins. Only one seller claims the roll is "unopened", but they still tell you not all the coins inside are like the end coins.
