I understand those who just use freshwater lures and saltwater lures and that is it. However you are correct when you say that carrying and using different bait helps to get different fish to bite more. I lvl up my fisherman in order to get fish I need for my alchemist and my culinarian. If I use lures I end up with a radom assortment of fish that is mostly too low lvled for my crafting classes. Using bait changes this. If sp is all you need lures is your answer, however gathering classes should be about more then just sp. This idea of a tacklebox is a great idea. However there should be some challenge in order to get it such as reaching lvl 25 fisherman or something. Maybe the fisherman's guild can give it to you in the storyline. I think it should be an item that is unique the the fisherman and therefore should not be given to everyone.