This is one of three, if not four depending on the cooking daily, that I do everyday. I was even guilty of not being on all day but logging on right before going to bed to do it. :P I've always loved fishing in game. I even won the tournament in Booty Bay twice for both items. :3 The fishing daily just feels different compared to all the other dailies. Hell, it feels different from most quests in general for that matter. You're not killing fifty million mobs, gathering some special node, or running errands for NPCs that apparently don't know what a mailbox is.
Like the others have said, the junk sells good.
It's nice having supplied hooks instead of going out specifically to farm mats for fish attractors.
Free motes is always a plus.
I love the Elixirs of Water Walking. <3 Made it so much easier for my babeh mage to turn in quests at the Throne of Elements.
You have a chance at spiffy loots!
Personally, I've so far gotten the improved fishing line, an Eye of the Sea, Toothy!, and the rum recipe. I'm still waiting for the hat since I never got the fishie at the tournament. : /