Color vs. black and grey? Color takes longer to pack in. More passes = more time = more money.
Placement matters, too. Getting inked on a bony area, like your ribs or your kneecap, is harder for them to stretch and work on. Expect a premium for those “special” spots. Blame your anatomy.
And location! A shop in Manhattan, New York is going to charge more than a shop in small-town Iowa. It’s the rent, folks. Location location location applies to tattoos, too.