because the menu is really simple:
burger, cheeseburger, double-double (double patty, double cheese)
small, med, large, x-large drinks
fries (1 size), choco/vanilla/strawberry milkshake
but you can order your hamburger any way you want. Pickles typically aren't included, onions usually aren't grilled, ketchup/mayo usually aren't included. The "secret menu available on the website and also posted in some retail locations (like the one in vegas back in 95)" is just there for ease of ordering.
typically when I go I get a cheeseburger and a lettuce salad (protein style hamburger) i end up paying more than for just a double-double, but I like the crispness of the protein style.