The game mechanics require 2 colors that each contain 2 suits. Playing cards fits this requirement, are widely available, and importantly everyone knows what the suits/colors are. The same isn't true if you used random companies or game characters.
Which is a good message that this type of role / career is not good for you. The excitement is in the winning, does not matter what is being traded as long as you win.
What’s the hyperbole? This is partly a recruiting tool. If you think the game is not exciting then this is probably not the career for you. Do you have something more substantive than a weak attack?