If they make a recipe it won't be worth 5k. That's CH M.O. They want you to trade a fish worth 5k for a recipe that gives you 5 minutes of some weak focus or vitality. I'll pass. They actually have a quest for medium xp where you have to give them a King Angler worth 4k... Seriously...I'll take my 4k. They don't care about fishing. That's why they haven't up graded fishing areas past the 3 high spots. To get the level 6 bear you have to be level 190. I would have to quit all other aspects of the game and fish for the next year in a half non stop to get to level 190. Not realistic or fun by any standard.
A few comments from personal experience (fishing level 191):
1. I agree that any recipe that used Golden Carp would not be worth 5k.
2. If you ever got to level 190, you would turn in the King Angler for the medium xp daily quest, as it's one of the few ways to make xp at that level.
3. Newer fishing spots for 190+ should absolutely be added - best place would be Corrupted Gardens.
4. The level 190 restriction on the level 6 bear is ridiculous; I cannot believe they even did that.
5. If you quit all other aspects of he game and fished for 3-4 months, you'd be level 190.