This is crazy talk.

Like you said @jarvie the DEC value of a card will form a floor on the market value of a card. Because why would a seller trade a card for less USD than they could get by just converting it to DEC? There are some transaction costs in there, but the market takes 5% anyways, which would be more than the transaction costs.

Complaining that market prices are higher than the DEC value is just that. Complaining.