I understand your point, and I agree with you. However, in fairness, that price difference is not entirely due to the cork-vs-screwcap. The Sancerre is probably more expensive in part because of the appellation "Sancerre". The Attitude probably uses some grapes outside Sancerre, so it is "merely" a Loire wine. The public misperception that appellation, like cork closures, automatically means a better wine allows them to charge a higher price. But that's another issue, isn't it?