In an ideal world, of course. But the reality of the situation is that it's an apples to oranges comparison. Standard Bicycle cards are produced in production runs of hundreds of thousands - or even millions - at a time. Premium decks like Sentinels or S&Mv5 or DeckONE are produced in very limited numbers, relatively speaking.
This means that the cost involved in production is much higher, not to mention the details and polish we put on each deck: embossing on the tuck case, metallic elements, etc. We do make every effort to keep prices down, which is why you may notice our playing card prices to be much more competitive than other sites. While our raw cost per deck has increased substantially with more intricate designs, our prices remain largely the same.
But we refuse to sacrifice on quality or design, no matter what the costs are. At the end of the day, artists have brushes, musicians have instruments, and construction workers have hammers. These are our tools. We want them to look good and perform well.