I don't see any point in ever using this kit. You didn't mention armour, but assuming you had full chain, you're still at a crazy disadvantage because your only firearm is your bow, and a flint and steel isn't going to kill anybody in a million years. You could just.. you know, use the archer kit and get armour, a bow and a sword :p
Donators can't be given any beneficial kits or items, as stated by the recent changes made to the EULA a few months back, but if this kit were to be added, i think most people would be donating for the crazy tank and swordsman kits, and not the fishing rod.. :s A fishing rod has only so many uses before it breaks, provides very little knockback and no damage. Yea, i suppose you could catch fish, but that leaves you with a few rivers, all in which hold huge activity, and once you have spent 15 minutes catching those fish, you can't cook them, whereas killing just one person gives you 15 cooked steak.