That buying power decreases over time. Something that costs 10 cents in the past isn't worth 10 cents in the present.
That inflation, dollar value, market value, profit margins don't remain the same over the course of time.
That a chocolate bar from a vending machine cost $.50 in the late eighties early nineties and now is $2.50.
Just because a product increases in price, doesn't determine what the product is used for. The price is what the market is willing to pay to maximize the profit of the corporation. It doesn't change the fact that it's a consumable item.