That varies on the shoe.
Nike produces shoes in runs, once they sell a full run, after market is the only way to get them, and the price is set based on demand / quantity.
More limited releases can be bought at retail, worn a few times (if kept clean and in good condition) and resold at a higher price.
Years ago, before the game blew up to what it is now, you could buy at an after market price and still make a decent profit or break even afyer wearing them.
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