A screw cap would do the job of stoppering just as well and doesn't need any special instrument, but the marketing guys insist than wine needs a cork. You have to open the bottle and then pour it sloshily into another container. THAT really will expose the wine to air and hasten the ageing process. We have about fifteen minutes left for questions, so don't miss this opportunity to ask Jancis about your favorite red or white. In that bracket, you avoid the most boring but also avoid paying for ego or rarity.
Prices tend to reflect production costs.
If you ever do open a really old bottle which may have had lead in the foil, make sure you wipe the bottle top really well. No need to have a different decanter for red and for white. But there's an aesthetic reason too. It can be nice to see the colour of a wine, red or white , properly in advance. Rack of Lamb, Chocolate dessert.