I think "Accessories" might be the wrong word to describe this department. One definition of the term accessory implies these items contribute to your fishing in a 'minor' or 'susidiary' way. Try telling that to the guy who owns a rod vault or tackle tote, or to the new angler who is benefitting from the wealth of knowledge contained in one of the OnTheWater shore guides. I much rather the alternate definition of accessories: adding to something else in order to make it more useful, versatile, or attractive. Take your time here, you're sure to find a fishing accessory that will contribute to your fishing.
Accessories are necessities for some. There are probably a lot of accessories you don't need but there are probably a lot of items out there that you can really benefit from. Whether they're carried on you, on your boat, or for transportation with your car there are a myriad of options to choose from that can greatly improve your experience.