Bidding results on
ebay can be a tough thing to explain â€" I've seen a large number of things go either way too cheap or for prices that were crazy high.
Regarding the SoL silver dollar, one thing I can offer is that maybe the top two bidders misinterpreted the shadowing on the lettering on the coin's reverse and thought they might be cherry-picking an unreported double-die coin. The lighting/scanning/imaging of the coin appears to "double" multiple letters within the Emma Lazarus quote, but this is just an imaging artifact and not real.