To be honest, Big Fishing is kind of useless. (Skip to bottom for kind of TLDR; )
Why?
Let's start what you actually need to be able to catch all the big fish (as in have over 380 gathering in fishing: Materia infused Gear +foragers fishing rod & foragers hat, +24 from food and +10 from FC buff or instead of FC buff have the halcyon rod supra):
1. You need to have gear for it and getting those gear may cost you a few mil if you don't want to farm all the materia for them and craft the gear yourself.
2. After you are done with having the max possible fishing with gear you can obtain. You need to spend a ton of time catching HQ silver sovereigns to get the second best fishing rod.
3. Spend a bit more time to catch more HQ silver sovereign to obtain the Foragers Hat.
4. Phew! That's for the gear, now you must obtain HQ Spinach quiches (4-10k each on the AH unless of course you want to cook them yourself) to obtain that +24 gathering to toss yourself up to 383 fishing and you have the max amount that's supposedly needed at the moment congratulations!
Wait what.. whats next? oh? catching the actual fish? Let's take a look on that.
5. All the fish have their unique weather conditions to spawn so you need to wait for the correct time & correct weather to catch your fish.
6. Well yay now it's the correct time, you go and fish with your hq spinach quiche that you have got just for this with the FC buff unless you are fortunate enough to obtain the halcyon rod supra.
7. You fish.
8. You fish some more.
9. and some more..
10. Now you could be doing this for a week if not more before you actually obtain your fish if you're unlucky. Even with max fishing the fish can still get away, it's not 100%.
11. Yeah you got your big fish that you wanted to get!
12. Wait what do I do with the big fish now that I got it? Oh yeah. You also need CUL Desynth high enough to actually be able to pop your fish into bits.
13. Go back to step 1 and take in on cul desynth. Desynth all the caught fish you can possibly obtain skill up with.
14. So now you have both Fishing gathering and cul desynth and let's blow up that fish for some swimsuits!
*Puff*
Either with 60-80 something % desynth chance it will blow up without you obtaining anything or then you will succeed, get a bit of skill up and obtain nothing, since obtaining the desired items from the fish only have something of a 7-10% chance of happening. If you have bad luck, begin again and do this as many times as you need to get the item off the fish.
;;TLDR;;;TLDR;;;TLDR;;;TLDR;
Now what's with the terribly long explanation with the steps and everything? The point is, obtaining these items takes a lot of time and even obtaining one of them takes a lot of luck. Even if you could get 500k to a million gil or more off each item you actually manage to obtain, I've begun to wonder that it's not actually worth it, because..
a) These items almost never sell and the competition of getting these sold at the auction house is FIERCE. Put your item on sale, after a minute you've already been undercut twice.
b) If they'd be worth any less, they'd not be worth trying for as there are many other ways that you can make a decent amount of gil instead of hitting it big once.
c) The only people that actually can afford to buy these are the 1% people that are fanatic enough to actually obtain vanity gear for their characters and have enough gil. The other type is the people who buy gil and well can spend it to whatever things they want.
d) If these items were any easier to get, the market would be flooding with them and the price would be so low that it'd not be worth it to actually progress this far to get the rewards off big fishing.
Now this needs a change.
There should actually be other uses for the big fish than this. Like exquisite foods that can only be made with these fish for huge stat+ benefits that'd make a decent gil when sold or then just sell the fish itself if you dont fancy creating the dishes. Other option would be an aquarium system where you can put the fish in that you catch even in miniature size and then have it on your house for display or "hang the big fish you caught up as a decoration on your wall"
Decoration like this: https://www.youtube.com/watch?v=m80jt6bm6ZA
This isn't a rant, it's my personal opinion on the problems with this system that I wanted to leave up for discussion.
Any thoughts or suggestions of making this a better system?