There are some who would feel that the lack of faces isn't a real "custom" design - but not all would agree. For some decks, especially those meant for use by professionals, a more standard face is preferred, with perhaps only small tweaks - maybe a unique color scheme on the courts or a deeper shade of red/lighter shade of black on the traditional pip/index colors.
I will say right off that a full-custom deck, requiring a higher amount of work, effort and creativity, will command a higher price more easily than something that's minimally customized, having only a unique back and perhaps unique jokers and Ace of Spades. A minimally-custom design will still cost just as much to print, mind you, but you're not simply paying for the printing when you're buying a custom deck of cards, are you?
Some manage to bump up the production values in other ways, too - maybe they use metallic inks in their standard faces, or maybe they go all out with bells and whistles on the tube box like embossing, foil stamping, custom seals, etc. That will help to make the project more appealing at a somewhat higher price, but a full-custom deck will still be thought of as more top-dollar than a nearly-standard deck in a fancy box.